1

August 2007TSX Venture: RDIOTCBB: RDIAF

2

This presentation includes certain statements and other information that may be deemed "forward-looking". Other than statements of historical fact all statements in this presentation that address future production, reserve or resource potential, exploration drilling, exploitation activities and events or developments that the Company expects are forward-looking statements. 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 market prices, exploitation and exploration successes, availability of capital and financing, and general economic, market or business conditions. Investors are cautioned that any such statements are not guarantees of future performance and that actual results or developments may differ materially from those projected in the forward-looking statements. For more 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.

Disclaimer

3

Investment Highlights

• Established alluvial producer in politically stable location

• Strong industry fundamentals with attractive demand profile

• Proven operations – scaleable capacity, long-life resources

• Producer of high value stones (+2 carats)• Operating margins approximately 50% with room to improve• Current production of 2000 carats (~US$3M revenue) per month

• Saxendrift acquisition to double resource base of diamondiferous gravels and create operating synergies

• Opportunity to impose RVI cost structure to transform margins

• Committed management team with broad geological and operational expertise

• Attractive valuation

4

Corporate Information (Pre-Offering)

0.5MOptions(av. price C$0.43)

30.0MShares Committed to vendors in JSE Listing*

140.0MTotal Maximum Shares

42.0MWarrants(C$0.60 to Nov 07, C$0.80 to Nov 09, C$1.00 to Nov 10)

68.3MIssued Share

Ticker Symbols TSX-V: RDI OTCBB: RDIAF

C$0.55Share Price as at 29 March 2007

C$25.0 – 42.0MExercise of Options/WarrantsC$29.9 – 46.9MTotal Maximum Cash

C$4.9MCash on Hand (March 2007)C$37.6MMarket Cap

*Approx, final number determined by market price immediately prior to JSE Listing

5

RDI

Klipdam Diamond Mining(Klipdam operations, SA)

H C van Wyk Diamonds(“HCVWD”, Holpan and Wouterspan operations, SA)

100%51%

51%

Galputs(SA diamond bearing deposits - trial mining)

100%2

Midamines Concession(Cuango River, DRC Feasibility)

100%

3 A net profit interest subject to exploration program and feasibility study

Staged acquisitionto 74% ownership

26% to BEE partner1

Staged acquisitionTo 74% ownership 26% to BEE partner1

Rockwell Diamonds Corporate Structure

Saxendrift (THG)(Middle Orange River ,SA – Conditional Acquisition)

80%3

Rockwell ResourcesRSA (Pty) Ltd.

2 Conditional Agreement1 23% in shares to H C van Wyk on Inward Listing

74% ownership26% to BEE partner

6

SpringbokSpringbok

KoaValleyKoaValley

Lower OrangeLower Orange

PrieskaPrieska

WouterspanWouterspan

DouglasDouglas

Middle OrangeMiddle Orange

KimberleyKimberleyBloemfonteinBloemfontein

Vaal RiverVaal RiverBloemhofBloemhof

JohannesburgJohannesburgVentersdorpVentersdorp

PretoriaPretoria

LimpopoLimpopo

BotswanaBotswana

NamibiaNamibia

ZimbabweZimbabwe

SwazilandSwaziland

LesothoLesotho

RSARSA

00 300300

KilometresKilometres

NN

Limpopo R

iver

Vaal River

Molopo

River

RietRiver

RietRiver

OrangeRiver

OrangeRiver

Holpan-KlipdamHolpan-Klipdam

GalputsGalputs

Southern AfricaExisting Operations

7

Growth Strategy

Organic growth:

• Optimize / expand Holpan-Klipdam & Wouterspan operations

• Evaluate / develop other properties already held in South Africa

• Develop DRC enterprise ~30km of 60km-long concession

Acquisitions:

• Consolidate properties adjacent to Holpan-Klipdam & Wouterspan, e.g. Saxendrift

• Target private & listed diamond companies in RSA

8

• John Bristow, PhD, President and COO – ex De Beers geologist, 25 years in alluvial diamond mining and kimberlite development

• Dave Copeland, CEO, P. Eng, CEO and Director – principal of HDI; geological engineer

• Dominique de la Roche, CFO Rockwell Resources RSA (Pty)Ltd – operational experience in senior and junior mining sectors, finance & corporate environments; expertise in mining taxation

• Hennie Van Wyk, Operations Director – 12 years in start-up, development and operation of alluvial diamond projects

• Jeffrey Brenner, Marketing and Sales Director – rough diamond expert, international trader and manufacturer

Committed Management Team

9

Scott Cousens Non - Executive Director

Jeffrey Brenner Non - Executive Director

Mark Bristow Non - Executive Director

Rene CarrierNon - Executive Director

Douglas SilverNon - Executive Director

Dominique de la Roche CFO (to join main Board)

Dr. John BristowPresident and COO, Director

David Copeland CEO, Director

Ronald ThiessenChairmanProposed Board Changes

• Dominique de la Roche will soon join the Board, replacing Jeffrey Mason

• David Copeland will replace Ronald Thiessen as Chairman, mid-2007

• Representative from BEE partner to be invited to join the Board

• One further Independent Non-Exec with mining and operational experience will also be added

Experienced Board of Directors

10

Strong Diamond Industry Fundamentals

• Demand exceeding supply• Demand driven by increase

in HNWI, world GDP growth and new consumers in India and China

• As wealth increases, demand for larger stones grows

• Prices for large, high quality stones continue to show strong increases

• Large, high value stones not at risk from synthetics

Diamond Supply Projections

Diamond Price Appreciation

Source: De Beers

0

Diamond Index (1948=100)Gold Index (1948=100)

1948

1952

1956

1960

1964

1968

1972

1976

1980

1984

1988

1992

1996

2000

2004

2008

2012

500

1000

1500

2000

2500

3000

3500

Diamond Index ForecastInde

x

Year

6,000

10,000

14,000

18,000

1994

1997

2000

2003

2006

2009

2012

2015

Roug

h de

man

d / s

uppl

y (US

$m) Rough Demand

Rough Supply

6,000

10,000

14,000

18,000

1994

1997

2000

2003

2006

2009

2012

2015

Roug

h de

man

d / s

uppl

y (US

$m) Rough Demand

Rough Supply

Source: BHPB

11

12001200

UpliftErosionUplift

ErosionAlluvial TerracesAlluvial TerracesAlluvial Terraces

DepositionDeposition

Atlantic OceanAtlantic Atlantic OceanOcean

Longshore driftweather/wind

LongshoreLongshore driftdriftweather/windweather/wind

240240 80 million years80 million years500500Raised

BeachesRaised

BeachesDrownedBeachesDrownedDrownedBeachesBeaches

Alluvial Diamond Deposits

• River transport away from kimberlite sources enhances diamond values

• Poor quality diamonds destroyed as gemstones survive

CalcreteRooikoppie

Upper Gravels

Basal Gravels

Bedrock

Trap Sites

ErodingKimberlites

ErodingKimberlites

3 – 12m

12

Holpan and Wouterspan Gravel Packages

Holpan Wouterspan

13

Middle Orange River – Size Does Matter

• The Middle Orange River district is well known for the occurrence of alluvial diamonds and large stones:

• ~85% > 1 carats• >20% > 10 carats• ~2% >100 carats• Large, gem-quality stones

recovered regularly• Average price

>US$1500/carat

SpringbokSpringbok

KoaValleyKoaValley

Lower OrangeLower Orange

Prieska

WouterspanWouterspan

DouglasDouglas

Middle Orange

KimberleyKimberleyBloemfonteinBloemfontein

Vaal RiverVaal RiverBloemhofBloemhof

JohannesburgJohannesburgVentersdorpVentersdorp

PretoriaPretoria

LimpopoLimpopo

BotswanaBotswana

NamibiaNamibia

ZimbabweZimbabwe

SwazilandSwaziland

LesothoLesotho

RSARSA

00 300300KilometresKilometres

00 300300KilometresKilometres

NNNN

Limpopo Rive

r

Vaal River

Molopo

River

RietRiverRiet

RiverOrangeRiver

OrangeRiver

Holpan- KlipdamHolpan- Klipdam

GalputsGalputs

Saxendrift

14

156 caratsFlawless D US$5.7M

(US$37,000/carat)

152 caratsFlawless DUS$4.3M

(US$28,000/carat)

34 caratsVivid Yellow US$720,000

(US$21,100/carat)

Recent Production (May 2006 – Jan 2007)

15

• Capital investment lower than Kimberlite operations

• Quicker start-up• Low operating costs

15

• Conventional earth-moving operation

• Processing & recovery via 200tph Bateman DMS plant

Mining Alluvial Diamonds

16

Existing Producing Assets

Holpan/KlipdamWouterspan

64%

3.23

8.99

2,900

0.31

2.4

57.6

Actuals 11 months to

31 Jan 2007 (unaudited)

50%

2.25

4.49

848

0.53

n/a

24*

43-101

Jan 2006

2.6n/aTonnes Mined (million tonnes)

30%36%EBITDA Margin

3.122.00Costs (US$ per tonne)

4.473.13Revenue per tonne (US$ per tonne)

9501,250Average diamond value (US$ per carat)

0.470.25Grade (carats per hundred tonnes)

21.460*Diamondiferous gravel (million tonnes)

Actuals 11 months to

31 Jan 2007 (unaudited)

43-101

Jan 2006

* R.H. De Decker, Pr.Sci.Nat., is the Qualified Person responsible for the inferred resource estimate.

17

• Introduce 3 shift CONTOPS• Reduce shut down time over Christmas holiday period• On-site improvements

• Wouterspan: New separate stripping fleet and second plant to be commissioned

• Holpan/Klipdam: Improve process flow; increase and optimise earth moving fleet

• Improvements to be funded from offering• Wouterspan C$10M in incremental capex• Holpan/Klipdam C$2M in incremental capex

• Continuous increases in monthly production• Wouterspan up from 160,000 tonnes 12 months ago to 250,000; expected

to reach 600,000 by mid 2008• Holpan/Klipdam up from 230,000 tonnes 12 months ago to 300,000;

expected to reach over 400,000 by mid 2008

Opportunities to Enhance Margins in Existing Operations

18

THG Saxendrift Acquisition

• Sale agreement announced 6th March 2007• Assets include 2 mothballed mines - well known to management• Includes plant and equipment, excellent infrastructure• Purchase consideration ZAR 100.4M (approx. C$15.9M)

• Credit facility in place to secure acquisition• Subject to Ministerial Consent and Competition Commission

approval (expected by 31st May 2007)

19

Saxendrift

• Located across the river (south-bank) from Wouterspan (north-bank)

• Contiguous diamond bearing gravel deposits

• Higher grades indicated at Saxendrift

• Similar diamond populations

57.682.0Diamondiferous gravel (million tonnes)

2,9001,400Ave Diamond Value (U$/carat)0.310.39Grade cpht

Wouterspan**Saxendrift*

*Venmyn 43-101 report** 11 months to January 2007, unaudited

20

Saxendrift – The Opportunity

• Unattractive margins under THG’s operating structure (~US$6 per tonne)

• Implement Rockwell’s operating expertise and cost structures (~US$3 per tonne) to significantly enhance margins

• Refurbish existing plant, install new plant, add new earth moving equipment

• Increase production throughput, margins & operational efficiencies

• Application of local management expertise (Hennie van Wyk) and familiarity with assets (John Bristow)

21

Rockwell Diamonds – Pro Forma

2,900

0.31

57.6

Wouterspan

950

0.47

21.4

Holpan/Klipdam

1500**

0.38*

159.0

Pro Forma

82.0Diamondiferous gravel (million tonnes)

1,400Ave Diamond Value (US$/carat)

0.39Grade cpht

Saxendrift

Resource Profile

*Weighted average** Assumed long term average price

• Resource base doubled by Saxendrift acquisition

• In-situ valuation approximately US$906,300,000

• Production forecast to reach 1.6M tonnes per month by 2011

• Based on revenues and costs equates on a 100% basis to:

• US$127M revenue per year

• US$63M operating margin per year

Group Production Profile (Monthly Average)

0

200

400

600

800

1000

1200

1400

1600

1800

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016

Tonnes ('000)

HOLPAN/KLIPDAM WOUTERSPAN

WOUTERSPAN EXP SAXENDRIFT

22

Rockwell Diamonds – Pro Forma Capital Structure (Post Offering)

*Approx, final number determined by market price immediately prior to JSE Listing

C$135.4M – C$152.2M325.0Maximum Total issued (assumes exercise of all warrants)

Broker Warrants(assume C$0.50)

New Warrants(assume C$0.70 to May 09)

Warrants(C$0.60 to Nov 07, C$0.80 to Nov 09, C$1.0 to Nov 10)

Options(av. price C$0.43)

Sub-TotalShares Committed to Vendors in JSE Listing*

Sub-Total

Placement(assume C$0.50 per Unit)

Issued Shares

Share Price as at 29 March 2007

4.2M

90.0M

42.0M

0.5M

188.330.0M

158.3

90.0M

68.3M

C$0.55

By May 2009

By May 2009

Now – Nov 2010

Aug 07Aug 07

May 07

May 07

April 07

Date

C$2.1M

C$63.0M

C$25.2M – C$42.0M

C$0.2M

C$45.0M

Potential cash inflow

Ticker Symbols TSX-V: RDI OTCBB: RDIAF

23

Existing Shareholders

• Upon inward listing on JSE, RVI’s interest in H C Van Wyk increases to 74%, following issue of c. 20m RVI shares to van Wyk vendors

• Hennie Van Wyk will be a major shareholder in RVI

• 26% interest retained for BEE partner on a project by project basis

1 Assumes shares owed to Vendors due on JSE Listing are issued now2 Assumes exercise of current outstanding warrants and options2 Assumes Placement at C$0.50 per Unit and Aljomaih maintaining pro rata ownership with pro rata participation in offering4 Assume exercise of all New Warrants

Fully DilutedPost-Placement 4

BasicPost-Placement 3

Fully DilutedPre-Placement 2

BasicPre-Placement 1Shareholders

325,087,621

60,481,262

8,481,262

32,000,000

20,000,000

230,887,621

44,481,262

8,481,262

16,000,000

20,000,000

140,887,621

60,481,262

8,481,262

32,000,000

20,000,000

100.0%100.0%100.0%100.0%98,387,621Diluted Outstanding

18.6%19.3%42.9%45.2%44,481,262Total

2.6%3.7%6.0%8.6%8,481,262Durnpike Vendors

9.8%6.9%22.7%16.3%16,000,000Aljomaih

6.2%8.7%14.2%20.3%20,000,000Hennie van Wyk

RVI Major Shareholders

24

JSE Inward Listing

• Requirement of SARB and Competition Commission

• Completion of 74% purchase of H C van Wyk Diamonds

• Facilitates a new shareholder in Hennie van Wyk

• Creates liquidity in a sophisticated alluvial diamond market

• Further fundraising will be undertaken at the time of JSE listing and management will subscribe for shares

• Listing process expected to complete [August 2007]

25

Black Economic Empowerment Partner

• African Vanguard Resources (“AVR”)

• Broad-based BEE vehicle with existing interests in mining (Harmony and Aflease)

• Principals• Sandile Zungu (BSc Eng, MBA)• Darryll Castle (BSc Eng, MBA)

• Paying their way to acquire 26% in RSA assets - stepwise process (15% + 11%)

• H C van Wyk Diamonds process conditionally complete

• Replicate same structure for Saxendrift Mine (Pty) Ltd

26

Highlights

• Established alluvial producer in politically stable location

• Strong industry fundamentals - Demand -> Supply

• Proven operations – scaleable capacity, long-life resources

• Producer of high value stones (+2 carats)• Operating margins approximately 50% with room to improve• Current production of 2000 carats (~US$3M revenue) per month

27

Highlights

• Last 11 months’ revenue from existing mines US$30.9M (unaudited, 100% basis), combined operating margin 51.3%

• Saxendrift acquisition will double resource base of diamondiferous gravels and create operating synergies

• Opportunity to impose RVI cost structure to transform margins

• Committed management team with strong geological and operational expertise

• Attractive Company valuation

28

Summary of the Offering

Private Placement Form of Offering:

Approximately 90M Units, with each Unit consisting of 1 common share and 1 share purchase warrant

Offering:

Marketed private placement in Canada, Europe and the United States and elsewhere as permitted by applicable exemptions. Purchasers will be subject to the standard resale restrictions of the relevant jurisdiction.

Offering Jurisdiction:

C$20.5M Saxendrift acquisitionC$10.0M Wouterspan expansion C$6.0M expansion / new opportunitiesC$8.5M working capital and fees

Use of Proceeds:

In the context of the marketPricing:

Approximately C$45M:C$35M in brokered offering, C$10M in non-brokered offering on identical terms

Offering Size:Rockwell Ventures Inc. Issuer:

29

Appendices

30

Unaudited but reviewed pro-forma Balance Sheet as at 30 November 2006

Pro-forma ConsolidatedASSETS (Expressed in C$)Current assets

Cash and equivalents 10,824,499Amounts receivable 4,798,095Prepaid and equipment deposits 613,189Inventory 1,738,854Due to related parties 547,490

Plant, buildings and Equipment 31,914,218Reclamation deposit 1,425,775Security deposit 32,190Mineral Property Interests 14,594,951

TOTAL ASSETS 66,489,262LIABILITIESCurrent liabilities

Credit facility 6,386,283Accounts payable 3,728,543Reclamation obligation 1,175,531Due to related parties 1,510,131

Future Income Taxes 4,638,781Capital Lease Obligations 13,532,872Loans payable 11,803,000Non controlling interest 6,758,023

Shareholders’ equity (deficit)Share Capital 33,281,574Contributed surplus 579,517Deficit (16,904,994)

TOTAL LIABILITIES 66,489,262Approximate Cash Balance as of end February 2007 22,000,000

31

Unaudited but reviewed pro-forma Income Statement 6 months 30 November 2006, assuming ownership of existing operations from 1 June 2006

Expressed in C$

REVENUES 25,321,186COST OF SALES 11,705,883

EXPENSESAmortization 2,594,468Exploration 700,693Legal, accounting and audit 643,135Office, salaries and administration 1,932,186Stock based compensation 56,435

TOTAL EXPENSES 5,926,917

OTHER ITEMSInterest and accretion expense 2,482,297Interest Income (52,509)Other expense (income) (250,643)Taxes 40,112

TOTAL 2,219,257

NON-CONTROLLING INTERESTS 4,627,758

GAIN / (LOSS) FOR THE PERIOD 841,370

32

• Corporate Governance• Best practices rigorously applied• Clear division of duties and accountability• Strong independent Directors• Remuneration, Audit and Technical Committees

• Health, Safety, Environmental and Community Policies• Based on International Best Practice and World Bank guidelines• Policies and Implementation reviewed regularly

Corporate Governance and HSEC Policies