[PPT] - PROGRESS UPDATE ON STRATEGY AND FUTURE PLANS JAMES CAMPBELL JUNE PowerPoint Presentation

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PROGRESS UPDATE ON STRATEGY AND FUTURE PLANS

JAMES CAMPBELL

JUNE 2012

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FOCUS ON DIAMOND VALUE MANAGEMENT

STOP PRESS!

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STEINMETZ FOREVERMARK JUBILEE PINK
Saxendrift diamond selected for display at the

TOWER OF LONDON as part of Queens Diamond Jubilee

The cushion cut, pink-brown diamonds weighing 35.60

carats, was cut from a 179.60 carat rough diamond that was sold into the Company’s BENEFICIATION joint venture with Steinmetz Diamond Group (“SDG”)

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FOCUS ON DIAMOND VALUE MANAGEMENT

AGENDA

WHO IS ROCKWELL?

– Beneficiation and Rough Diamond Production – Operations and Resources – Team – Capital structure and shareholding

PROGRESS UPDATE

– Performance overview – Strategic review – Progress with turnaround – Investments and Technology Projects – Valuation Gap

WAY FORWARD

– Operational targets – Growth objectives – Diamond sector fundamentals – Priorities and outlook

3 First diamonds recovered from bulk x-ray machine at Saxendrift

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WHO IS ROCKWELL?

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FOCUS ON DIAMOND VALUE MANAGEMENT

BENEFICIATION JOINT VENTURE: SIGNIFICANT VALUE ADD

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ROUGH POLISHED BENEFICIATION VALUE ADD 105 ct Type II

A, Middle Orange

35 ct D color internally

flawless Sold for $230,000/ct +62% on initial rough sale price

212 ct yellow,

Middle Orange

102 ct vivid yellow

+50% on initial rough sale price

128 ct yellow,

Middle Orange

81 ct vivid yellow

Not yet sold Steinmetz Diamond Group (SDG) profit share agreement (>2.8 carat stones)

MARKET RELATED PRICES for diamonds sold into JV + 50% profit share
Realized revenue of $7.8m in F2012
±25% of revenue from beneficiation, expected to increase

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FOCUS ON DIAMOND VALUE MANAGEMENT

ROCKWELL ROUGH DIAMOND PRODUCTION: AVERAGE US$/CARAT

$90/carat

<0.3 c/stone #

$1,100 /carat

~1.2 c/stone #

$2,000/carat

~2.5 c/stone # World Diamond Average

$700/carat

~0.9 c/stone #

Tirisano

(North West Province, RSA)

Klipdam

(Vaal River, RSA) Saxendrift* /Wouterspan/Niewejaarskraal (Middle Orange River, RSA) Small diamonds used in lower price point and pavé jewellery Engagement rings (Bridal-range), mid to high price point jewellery Engagement rings, high price point jewellery

High-end luxury jewellery High Net Worth Individuals Investment Stones

# - Rough stone average sizes 6 * - Before increasing the bottom cut off to 5mm

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FOCUS ON DIAMOND VALUE MANAGEMENT

ROCKWELL OPERATIONS AND PROJECT LOCALITIES: NORTHERN CAPE AND NORTH WEST PROVINCES, SOUTH AFRICA

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FOCUS ON DIAMOND VALUE MANAGEMENT

Category Volume (m3) Carats Value (USD) millions Feb 28 2011 Probable reserves 4,565,400 22,827 46.3 Indicated resources 34,787,600 675,412 489.6 Inferred resources 82,062,000 828,641 1,141.1 1,677.0

See www.rockwelldiamonds.com for detailed 43-101 Mineral Reserves & Resources: At 28 February 2011. Estimates completed by Rockwell’s Manager, Resources, G.A. Norton, (Pr.

Sci. Nat.), a qualified person who is not independent of the Company.

Reviewed by T.R. Marshall, PhD, (Pr. Sci. Nat.), Marshall, an independent qualified person

EXTENSIVE DEPOSITS TO BENEFIT FROM DIAMOND FUNDAMENTALS

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Operation Processing capacity (m3 p.m. ) Carats per month 43-101 value (US$ per carat) Life of Mine (years) Middle Orange River: Saxendrift 150,000 750 2,029 5 Vaal River: Holpan* and Klipdam Klipdam: 90,000 Klipdam: 850 Klipdam: 1,229 Klipdam: 2 Ventersdorp: Tirisano 90,000 1,400 606 18

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FOCUS ON DIAMOND VALUE MANAGEMENT

LEADERSHIP TEAM WITH CREDENTIALS TO DELIVER VALUE

Board of Directors: Mark Bristow (Chairman) Dave Copeland Richard Linnell Willem Jacobs Sandile Zungu Johan van’t Hof Stephen Dietrich A leading international diamantaire and specialist in valuation, marketing and sales of rough diamond production from alluvial deposits.

Diamond Marketing & Sales Manager Jeffrey Brenner

Geological, mineral resource management and production experience in alluvial diamond deposits, diamond and coal exploration. Qualified person and Pr.Sci.Nat.

Group Technical Manager Glenn Norton, BSC (Hons)

9 Seasoned diamond executive with career spanning over 20 years at De Beers and 4 years as Managing Director of African Diamonds plc. FIMMM, C.Eng, C.Sci and Pr.Sci.Nat.

President and CEO James Campbell, BSc (Hons ) ARSM, MBA (Dunelm)

>12 yrs in investor relations and corporate development. Worked as a sell side analyst and in-house IRO across industry sectors.

Corporate Development Stéphanie Leclercq BSc, CFA

Mining and corporate experience with junior and senior mining companies with

perations in SA, Australia and Canada.

Knowledge of public listed mining Companies.

CFO Gerhard Jacobs, BAcc, MBA Group HR/IR Manager Richard Mhlonto, Nat Dip (HR Management & Development)

Extensive HR & Industrial Relations management experience including

rganizational and structural design

initiatives as well as strategy development and implementation. >30 yrs in diamonds incl. mgt. roles at Orapa (world’s largest diamond mine) & The Oaks (De Beers’ smallest mine). Operations Manager at Pangea DiamondFields plc from 2007.

COO Michael Hunt, MSc (Advanced Chemical Engineering)

Expert in economic diamond metallurgy. Contracted to Rockwell for fiscal 2012.

Dr Kurt Petersen, Ph.D. (Stellenbosch)

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FOCUS ON DIAMOND VALUE MANAGEMENT

CAPITAL STRUCTURE AND SHAREHOLDING

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Number of shares Shares outstanding 47,942,746 Warrants

Options ($0.90-9.45)

2,121,931 Convertible Debt (~$0.56) 3,499,257 Fully Diluted 53,563,934 Top shareholders (% shares in issue) Strategic:

Daboll (Steinmetz)

21.3%

Godia Capital

8.3%

Middle East Investors

7.1% Institutional:

Conus Partners

6.9%

Earth Resources (ERIG)

3.6%

Craton Capital

2.6%

Wells Capital

1.6% Other:

Etruscan

2.6%

Mark Bristow

1.2%

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PROGRESS UPDATE

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FOCUS ON DIAMOND VALUE MANAGEMENT

FISCAL 2012 PERFORMANCE OVERVIEW

Substantial progress with REPOSITIONING of Rockwell by new management
Beneficiation continues to add value: 64% INCREASE in beneficiation revenues to $7.8m
Saxendrift performance trending up: Direct result of DIAMOND VALUE MANAGEMENT strategy

– 26% INCREASE in rough diamond sales to US$17.5m with 22% increase in average carat value

Long term production asset BROUGHT ON STREAM: Tirisano mine ramp up making progress

– One time cost of ramp up of $6.7m charged to earnings

Operating profit of $7.3m: Mining costs DOWN 4% despite impact of Tirisano costs
Net loss of $13.7m: Impact of STRATEGIC DECISIONS place Rockwell on a SOLID FOOTING

with cleaner balance sheet – Flow through to financials as mines continue to improve production with lower unit costs – Midamines settlement and associated costs ($1.5m) and asset impairment ($4.9m)

CONTOPS implemented in January 2012 at Saxendrift and Klipdam
Net cash balances of $9.9M preserved to fund growth
Investments positioned Rockwell to deliver further IMPROVEMENTS and pursue GROWTH OPPORTUNITIES

in fiscal 2013

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FOCUS ON DIAMOND VALUE MANAGEMENT

STRATEGIC REVIEW CATALYZED CORPORATE TURNAROUND

STRATEGIC REVIEW initiated after management changes in December 2010
To achieve key CORPORATE OBJECTIVE: increasing annual production of

high-quality gemstones to 120,000 carats in 5 yrs

TURNAROUND commenced with appointment of new management team

in June 2011 – CEO + COO with >50 years joint diamond experience – DIAMOND VALUE MANAGEMENT: Brought focus on quality and embedding new work culture throughout operations

Comprehensive OVERHAUL of business focused on

– Optimizing the productive mines to deliver better returns – Driving down costs – Improving metallurgical processes – Focus on recovery of diamonds as part of diamond value management

Next phase: LEVERAGE PRODUCTION PROFILE by developing asset

inventory + possible M&A opportunities

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FOCUS ON DIAMOND VALUE MANAGEMENT

PROGRESS ON STRATEGIC REVIEW

Understanding of GEOLOGY found to be rigorous with NI 43 101 reports on all properties
Production issues in plant environment addressed through increased focus on DIAMOND PROCESSING

METALLURGY

SAXENDRIFT: Completion of new FIT FOR PURPOSE in field screen and bulk x-ray pilot project

– ON SCHEDULE: Delivering positive recovery performance and results – New process technologies: BLUEPRINT for future mine development

KLIPDAM: Economics for remaining LOM improved

– Mine plan adjusted to Rooikoppie with less intense earthmoving requirements

TIRISANO: Ramp up in progress

– Short term impact on profitability: $6.7m = Full operating and ramp up costs expensed

HOLPAN: Put on care and maintenance in May 2011

– Was delivering marginal results and reaching end of LOM – Options to bring this asset to account under consideration

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FOCUS ON DIAMOND VALUE MANAGEMENT

CORPORATE LEGACY ISSUES RESOLVED

RECAPITALIZATION in Q3: Private placement raised $7.8m + $6.5m from sales of non-core and underutilized assets

– Partly deployed: Implement technology improvements at Saxendrift and complete Tirisano plant – Solid business case to underpin all further use of funds

RESOLUTION of Midamines dispute: Final settlement of $1.2m paid

– Company is not aware of any other outstanding litigation

FINALIZATION of an agreement with AVR: Effectively unwinds 2008 BEE deal (Northern Cape operations)

– Included acquisition of AVR’s Jasper Mine: contiguous to Saxendrift Mine with potential to extend LOM – In negotiations to introduce other BEE groupings

STRENGTHENED Board of Directors:

– Chairman: Mark Bristow – Non-executives + audit committee: Johan van ‘t Hof and Stephen Dietrich

In depth analysis of ASSET REGISTER to ensure accurate reflection of assets in balance sheet

– $4.9m impairment of property, plant and equipment

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FOCUS ON DIAMOND VALUE MANAGEMENT

DIAMOND VALUE MANAGEMENT: TANGIBLE BENEFITS IN Q4

Production Sales and inventories Volume (m3) Carats Mining costs Value of Sales (US$) Sales (carats) Average value (US$ / carat) Inventories (carats) Fourth quarter fiscal 2012 661,627 4,043 10,370,000 6,030,376 5,795 1,041 114

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SAXENDRIFT: 42% increase in rough diamond sales to US$17.5m with 32% increase in carats sold

– 50% increase in carats produced and 5% drop in unit cost

TIRISANO: Ramp up in progress with revenue of US$0.5m

– Good progress with wet front end

STRATEGIC DECISIONS: Holpan mine on care and maintenance and trial mining at Klipdam Extension ceased
Cost per carat DOWN 6%: Total mining costs down 3%

– Despite impact of Tirisano and upward pressure due to fuel, wages and maintenance costs

CASH POSITIVE with net cash of $9.9m: After funding capex of $4.0m

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FOCUS ON DIAMOND VALUE MANAGEMENT

TECHNOLOGY PROJECTS AT SAXENDRIFT: IN FIELD SCREEN

CHALLENGE:

– High sand content in gravel and productivity impact when processing wet gravels

SOLUTION:

– 3.0m x 8.0m Dabmar Bivitec screen commissioned in November 2011 – Designed to treat sandy and wet gravels at required processing rates

IMPACT:

– Running at > 95% efficiency and operating at 17% above design throughput – Monthly volumes up 30% (incl. impact of contops and increased bottom cut off)

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FOCUS ON DIAMOND VALUE MANAGEMENT

TECHNOLOGY PROJECTS AT SAXENDRIFT: BULK X-RAY

CHALLENGE:

– Low efficiencies in traditional pan plants and final recovery

SOLUTION:

– High throughput Bourevestnik (BV) sorter and

ne BV single particle sorter to improve

concentrate efficiency and final sorting of diamond bearing ore (capex $1.5m)

IMPACT:

– Recovery in first 4 weeks: 316 stones = 1,109 carats have been recovered – 14 stones >10 carats with largest weighing 76.4 carats

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FOCUS ON DIAMOND VALUE MANAGEMENT

TECHNOLOGY PROJECTS AT TIRISANO: WET FRONT END

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CHALLENGE:

– Current dry front-end cannot deal with wet, clay rich gravels

SOLUTION:

– High water volume monitoring and screening plant

(capex $200k)

IMPACT:

– Currently being production commissioned

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FOCUS ON DIAMOND VALUE MANAGEMENT

CASHFLOW: INVESTING IN CAPACITY FOR GROWTH

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BALANCE SHEET PROVIDES REQUIRED WORKING CAPITAL TO ACHIEVE SHORT TO MEDIUM TERM OBJECTIVES

2 4 6 8 10 12 14 16 18 20 Opening cash and cash equivalents Cash Generated by Operations Net changes in working capital Proceeds of Private Placement Proceeds of convertible bond Proceeds from sale of assets Capex: Tirisano, Saxendrift and purchase of mineral property interests Movement in reclamation deposits Other cash flows Closing cash and cash equivalents $m

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FOCUS ON DIAMOND VALUE MANAGEMENT

CORRELATION: RESOURCES TO PRODUCTION

0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 Q1 2007 Q2 2007 Q3 2007 Q4 2007 Q1 2008 Q2 2008 Q3 2008 Q4 2008 Q1 2009 Q2 2009 Q3 2009 Q4 2009 Q1 2010 Q2 2010 Q3 2010 Q4 2010 Q1 2011 Q2 2011 Q3 2011 Q4 2011 Grade ct/100m³

Klipdam Recovered Grade vs. Resource Grade

Mine Grade 43101 Grade Budget Grade 0.0 0.5 1.0 1.5 2.0 2.5 3.0 May 08 Aug 08 Nov 08 Apr 09 Jul 09 Oct 09 Jan 10 Apr 10 Jul 10 Oct 10 Jan 11 Apr 11 Jul 11 Oct 11 Jan 12 Apr 12 Grade ct/100 m³

Saxendrift Recovered Grade vs. Resource Grade

Mine Grade 43101 Grade Budget Grade Linear (Mine Grade)

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FOCUS ON DIAMOND VALUE MANAGEMENT

INDEPENDENT VALUATION: CONFIRMED VALUATION GAP

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Adjusted book value / Fair Market Value of Properties using discounted cashflow

Resource properties: $121.9m - $137.3m Adjusted book value: $149.5m - $165.0m

Wouterspan ($47.4m - $54.8m) Tirisano ($17.6m - $20.0m) Klipdam ($3.6m) Holpan ($281,000) Niewejaarskra al ($37.4m - $42.5m) Saxendrift ($15.5m - $16.1m) 30% 30% 40% 10 20 30 40 50 60 70

Weighted market value estimate: $62m

Adjusted book value method Guideline public company method Trading price method Additional details contained in “Additional Information”

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FOCUS ON DIAMOND VALUE MANAGEMENT

PEER GROUP REVIEW OF DIAMOND JUNIORS: FURTHER CONFIRMATION OF ROCKWELL’S VALUE UPSIDE

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Source: Company websites, ThomsonReuters 200 400 600 800 1000 1200 Diamond- corp Firestone Lucara Mountain Province Namakwa Rockwell Diamonds Stellar Trans Hex

Average price/carat sold (US$)

1 2 3 4 5 6 7 Diamond- corp Firestone Lucara Mountain Province Namakwa Rockwell Diamonds Stellar Trans Hex

Price: Tangible Book Value

0% 2% 4% 6% 8% 10% 12% Diamond- corp Firestone Lucara Mountain Province Namakwa Rockwell Diamonds Stellar Trans Hex

Market Cap: Resource value

$(100) $- $100 $200 $300 $400 $500 Diamond- corp Firestone Lucara Mountain Province Namakwa Rockwell Diamonds Stellar Trans Hex

Enterprise value ($m)

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WAY FORWARD

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FOCUS ON DIAMOND VALUE MANAGEMENT

OPERATIONAL TARGETS FOR FISCAL 2013

MINE PRODUCTION (m3) GRADE (carats/100m3) CASH OPERATING COST/m3 CAPITAL EXPENDITURE REVENUE/CARAT (US$) BUDGET F2012 KLIPDAM At name plate capacity (90 000) Stable $7.32* $10.72 Minimal In line with F2012 YTD SAXENDRIFT Increase to 150 000 with new in- field screen Stable $8.42 $8.27 $400,000 In line with two year average TIRISANO Ramping up to 90,000m3 p.m. 06/2012 Gradual improvement to 1.8 by 06/12 $10.38** $20.11 $750,000 In line with stated prices of $700

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ZAR/CAD exchange rate of 8.00
Full implementation of contops at all operations for F2013
Corporate expenses budgeted to remain stable
Beneficiation (stones > 2.8 carats) not included in average price per carat expectation

* Change of mining plan ** Ramp-up

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FOCUS ON DIAMOND VALUE MANAGEMENT

GROWTH PLAN: CREATE CRITICAL MASS AND SCALE

Further upside potential from Jasper Mine Reviewing additional capital requirement to fund expansion with preference for internal cash flows

Projected production based on mine plans in November 2010 preliminary assessments (Tirisano, Wouterspan and Niewejaarskraal) and prefeasibility study (Saxendrift). Refer to Saxendrift resource statement on www.rockwelldiamonds.com

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* Based on budgeted carat values for 2013 and 2.5% annual price increases

200,000

400,000 600,000 800,000 1,000,000

20,000

40,000 60,000 80,000 100,000 120,000 140,000 F2012A F2013 F2014 F2015 F2016 F2017 F2018 Volume / month (m3) Total carats / year

Production targets

Niewejaarskraal Wouterspan Tirisano Klipdam Saxendrift Other Total Production / month 50,000,000 100,000,000 150,000,000 200,000,000 250,000,000 300,000,000 F2012A F2013 F2014 F2015 F2016 F2017 F2018 Revenue / year ($m)

Revenue targets *

Other Niewejaarskraal Wouterspan Tirisano Klipdam Saxendrift

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FOCUS ON DIAMOND VALUE MANAGEMENT

REVIEW OF INVESTMENT OPTIONS: VALUE CREATION POTENTIAL

2 4 6 8 10 12

Wouterspan Niewejaarskraal Saxendrift Extension Tirisano Expansion

NPV / Capital Expenditure (times)

27 Wouterspan Saxendrift Extension IFS Only Saxendrift

Extension Complete Plant Tirisano Expansion R 0 R 100 R 200 R 300 R 400 R 500 R 600 R 700 R 800 R 900 50 100 150 NPV (ZAR millions) Resource Size m3 (millions)

Rockwell Diamonds Inc Capital Development (Bubble Size = Capital Requirement)

Niewejaarskraal Projected production based on mine plans in November 2010 preliminary assessments (Tirisano, Wouterspan and Niewejaarskraal) and prefeasibility study (Saxendrift). Refer to Saxendrift resource statement on www.rockwell diamonds.com.

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FOCUS ON DIAMOND VALUE MANAGEMENT

STRONG FUNDAMENTALS FOR DIAMOND SECTOR

Diamond DEMAND in carats forecast to grow at 6% p.a. to 2020

– OUTPACING annual SUPPLY growth of 2.8% – CHINESE and INDIAN MIDDLE CLASS to double by 2020

ECONOMIC UNCERTAINTY currently impacting sentiment in diamond market

– Industry OVERSTOCKED with expensive rough diamonds – Resulting in pricing slowdown, especially for smaller stones

Growing SCARCITY of +2CT diamonds

– Globally: Currently represents 5% of diamond PRODUCTION and 50%

f sales VALUE for producers

28 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Saxendrift Klipdam Tirisano % of carats exceeding 2 cts % of revenue exceeding 2cts ROCKWELL PRODUCTION PROFILE BIASED TOWARDS LARGE STONES

ROCKWELL PRICING against current market

– SMALLER STONES: Reduction of ±20% – >2 CARATS : Stable pricing – LARGE SPECIALS: Strong demand

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FOCUS ON DIAMOND VALUE MANAGEMENT

PRIORITIES AND OUTLOOK: FISCAL 2013

KLIPDAM: Achieve volume targets and improve lower

unit costs under leadership of new Mine Manager

SAXENDRIFT: Optimize mine plan + continue optimizing

in field screen

TIRISANO: Ramp up to full production + complete wet

front end + improve availability of earthmoving fleet

BEE: Complete process to introduce new partner and

secure funding

CORPORATE: Deploy bulk X-ray technology at

Saxendrift for bulk sampling and other projects

GROWTH: Planning and feasibility of Wouterspan using

new technology blueprint

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INCREASING DEMAND from China and India and

reducing supply

Prices and demand expected to continue

INCREASING

Rockwell’s BALANCE SHEET provides working

capital for short to medium term plans

Ongoing review of potential corporate actions for

GROWTH

Continue adding value through BENEFICIATION joint

venture with Steinmetz

Deliver on OPERATIONAL PRIORITIES to start

seeing financial benefits PRIORITIES: CEMENT TURNAROUND PROGRESS OUTLOOK: POSITIVE LONG TERM FUNDAMENTAL

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FOCUS ON DIAMOND VALUE MANAGEMENT

FORWARD LOOKING STATEMENTS

Except for statements of historical fact, this presentation release contains certain "forward-looking information" within the meaning of applicable securities law. Forward- looking information is frequently characterized by words such as "plan", "expect", "project", "intend", "believe", "anticipate", "estimate" and other similar words, or statements that certain events or conditions "may" or "will" occur. Although the Company believes the expectations expressed in such forward-looking statements are based on reasonable assumptions, such statements are not guarantees of future performance and actual results or developments may differ materially from those in the forward-looking statements. Factors that could cause actual results to differ materially from those in forward-looking statements include uncertainties and costs related to exploration and development activities, such as those related to determining whether mineral resources exist on a property; uncertainties related to expected production rates, timing of production and cash and total costs of production and milling; uncertainties related to the ability to obtain necessary licenses, permits, electricity, surface rights and title for development projects; operating and technical difficulties in connection with mining development activities; uncertainties related to the accuracy of our mineral resource estimates and our estimates of future production and future cash and total costs of production and diminishing quantities or grades if mineral resources; uncertainties related to unexpected judicial or regulatory procedures or changes in, and the effects of, the laws, regulations and government policies affecting our mining

perations; changes in general economic conditions, the financial markets and the demand and market price for mineral commodities such and diesel fuel, steel,

concrete, electricity, and other forms of energy, mining equipment, and fluctuations in exchange rates, particularly with respect to the value of the US dollar, Canadian dollar and South African Rand; changes in accounting policies and methods that we use to report our financial condition, including uncertainties associated with critical accounting assumptions and estimates; environmental issues and liabilities associated with mining and processing; geopolitical uncertainty and political and economic instability in countries in which we operate; and labour strikes, work stoppages, or other interruptions to, or difficulties in, the employment of labour in markets in which we

perate our mines, or environmental hazards, industrial accidents or other events or occurrences, including third party interference that interrupt operation of our mines or

development projects. For further information on Rockwell, Investors should review Rockwell's annual Form 20-F filing with the United States Securities and Exchange Commission www.sec.com and the Company's home jurisdiction filings that are available at www.sedar.com. This presentation also uses the terms 'indicated resources' and 'inferred resources'. Rockwell Diamonds Inc. advises investors that although these terms are recognized and required by Canadian regulations (under National Instrument 43-101 Standards of Disclosure for Mineral Projects), the U.S. Securities and Exchange Commission does not recognize them. Investors are cautioned not to assume that any part or all of the mineral deposits in these categories will ever be converted into reserves. In addition, 'inferred resources' have a great amount of uncertainty as to their existence, and economic and legal feasibility. It cannot be assumed that all or any part of an Inferred Mineral Resource will ever be upgraded to a higher category. Under Canadian rules, estimates of Inferred Mineral Resources may not form the basis of feasibility

r pre-feasibility studies, or economic studies except for Preliminary Assessment as defined under 43-101. Investors are cautioned not to assume that part or all of an

inferred resource exists, or is economically or legally mineable. The securities of Rockwell being offered have not been, nor will be, registered under the U.S. Securities Act and may not be offered or sold within the United States or to,

r for the account or benefit of, U.S. persons absent U.S. registration or an applicable exemption from U.S. registration requirements. This information does not constitute

an offer or sale of securities in the United States. Prior to making any investment decision, investors should consult a professional advisor.

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SLIDE 31

ADDITIONAL INFORMATION

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FOCUS ON DIAMOND VALUE MANAGEMENT

SUSTAINABLE DEVELOPMENT

Supporting LOCAL ECONOMIC DEVELOPMENT

– LOCAL BENEFICIATION: 85% of diamonds in South Africa – Provided STARTUP CAPITAL and mentorship for construction and brickmaking factory

SAFETY: Committed to providing safe working environment

– ONE MILLION LTI FREE hour record at Saxendrift

Employment: 683 full time employees

– Total of 79 new jobs created with conversion to CONTOPS in Northern Cape

Corporate Social Investment

– Supporting LOCAL ORGANIZATIONS focused on under privileged children, education and feeding schemes for elderly

Managing ENVIRONMENTAL impact: REHABILITATION as

land is mined

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FOCUS ON DIAMOND VALUE MANAGEMENT

INDEPENDENT VALUATION1: CONFIRMED VALUATION GAP

33 1. The valuation, dated February 28, 2011, conducted by Jennifer Lucas, MBA, CBV, ASA,

f Evans & Evans Inc.

1. Valuation of 74% of mine 2. Discount rates: Wouterspan, Tirisano and Niewejaarskraal: 25.36% to 28.96% Klipdam, Holpan and Saxendraft: 22.36% to 24.96% 4. Adjustments to balance sheet of Rockwell to evaluate fair value of net assets at February 28, 2011

Adjusted book value method using discounted cashflow Operation Value range Fair Market Value2 Wouterspan3 $47.4m - $54.8m Tirisano3 $17.6m - $20.0m Klipdam3 $3.6m Holpan3 $281,000 Niewejaarskraal3 $37.4m - $42.5m Saxendrift3 $15.5m - $16.1m Resource properties $121.9m - $137.3m Adjusted book value4 $149.5m - $165.0m Valuation method Midpoint of fair market value ($m) Weighting Value ($m) Weighting Value ($m) Trading price method5 25.28 40% 10.11 40% 10.1 Guideline public company method6 15.80 30% 4.74 25% 3.95 Adjusted book value method 157.25 30% 47.18 35% 55.04 Total 62.00 69.10

5. Valuation using average trading price of Rockwell for the 10 and 90 days preceding the valuation date 6. A guideline public company method comparing Rockwell’s average dollar value per enterprise value of reserves and resources to eight peer group companies