Botswana Resource Sector ConferenceBotswana – Opportunities for large kimberlite

discoveriesGaborone – 25th July 2007

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Important notice

These Presentation Materials do not constitute or form part of any invitation, offer for sale or subscription or any solicitation for any offer to buy or subscribe for any securities in the Company nor shall they or any part of them form the basis of or be relied upon in any manner or for any purpose whatsoever.

These Presentation Materials must not be used or relied upon for the purpose of making any investment decision or engaging in an investment activity and any decision in connection with a purchase of shares in the Company must be made solely on the basis of the publicly available information. Accordingly, neither the Company nor its directors makes any representation or warranty in respect of the contents of the Presentation Materials.

The information contained in the Presentation Materials is subject to amendment, revision and updating in any way without notice or liability to any party. The presentation materials contain forward-looking statements which involve risk and uncertainties and actual results and developments may differ materially from those expressed or implied by these statements depending on a variety of factors. No representation or warranty, express or implied, is made as to the fairness, accuracy or completeness of the information or opinions contained herein, which have not been independently verified.

The delivery of these Presentation Materials shall not at any time or in any circumstance create any implication that there has been no adverse change, or any event reasonably likely to involve any adverse change, in the condition (financial or otherwise) of the Company since the date of these Presentation Materials.

The Presentation Materials are confidential and being supplied to you for your own information and may not be reproduced, further distributed, passed on, or the contents otherwise divulged, directly or indirectly, to any other person (except the recipient’s professional advisers) or published, in whole or in part, for any purpose whatsoever. The Presentation Materials may not be used for the purpose of an offer or solicitation to subscribe for securities by anyone in any jurisdiction.

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Petra Overview

Johan Dippenaar - CEO

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Petra’s strategy

Petra Diamonds is a diamond mining group focused on the mining, exploration and beneficiation

of diamonds from Africa’s rich resources

Petra’s strategy is to build a portfolio of producing mines (500,000 carats p.a. by 2009/10) with

beneficiation capability, combined with a world class exploration base, achieving the objective of becoming a successful mid-tier diamond group

Petra is well on the way to achieving this strategy

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Group structure

Petra Diamonds

Production Exploration Beneficiation

South AfricaStar

Helam

Sedibeng

Koffiefontein

Early stage exploration

Angola - Luangue

Botswana - KalahariCalibrated Diamonds

Advanced exploration

Angola – Alto Cuilo

Sierra Leone - Kono

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Petra’s operations

South AfricaHelam

Koffiefontein

Sedibeng

Star

Calibrated Diamonds

Sierra Leone Kono Project

BotswanaKalahari Diamonds

AngolaAlto Cuilo

Luangue

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South Africa – producing mines

4 producing kimberlite mines; Koffiefontein –underground pipe and Helam, Sedibeng, Star -fissureProduction for 12 months to June ’08 expected to be well over 200,000 caratsAfter De Beers, the largest producer of diamonds by volume and the largest employer in diamond mining in South Africa

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South Africa – expected production growth

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Car

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per a

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Production 2006 175,000 carats

Expected SA production

growth to 2010 approx. 300,000

carats; group target 500,000

carats

2005/6 2009/10

Sou

th A

frica

Gro

up

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Calibrated Diamonds

Beneficiation

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Beneficiation – Calibrated Diamonds

Significant value (approx. 50%) is added to rough diamond production world wide through the polishing process

With Calibrated, Petra can beneficiate its own production, participating in this value-add

Calibrated has the potential to significantly enhance Petra’s revenues and cashflows

Acquisition also in line with focus of African producer countries to beneficiate diamonds at source

Transparency of Petra production gives Petra the ability to build a ‘mine to finger’ supply chain

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Sierra Leone

Exploration –Advanced

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Kono project in the world renowned Koidu diamond field51% interest with JV partner Stellar Diamonds (ex Mano River Resources) (49%)Test shafts progressing well – expect further updates on grade and quality early 2008Diamond recovery commenced June ’06 –638 diamonds (58.78 carats) recovered from shaft sinking (March ’07)Planning to fly EM survey over licence areas later this year – potential for blows and small pipes

Sierra Leone – Kono project

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Angola

Exploration –

Early stage & Advanced

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Angola Operations

• Luangue

• Alto Cuilo

• Focus of kimberlite diamond mining and exploration in Angola

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Alto Cuilo is Petra’s flagship project, an opportunity of massive potential upside

Petra is in JV with BHP Billiton (30 April ’07 – BHP Billitonfunding US$40.3m - one of the highest spends in BHP Billiton’sglobal mining & mineral exploration portfolio)

73 kimberlites identified from 91 targets drilled – surface area of kimberlites > 1,400 hectares

Large diameter drill and mobile DMS plant have started taking and treating samples– first results released and more expected shortly

Highly encouraging mantle geotherm, diamond indicator mineral chemistry and initial microdiamond counts

Angola – exploration – Alto Cuilo

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Alto Cuilo - Location

Saurimo

Lucapa

ChicapaCatoca

ML Complex

Project Luangue

Project Alto Cuilo

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March ’07 - Petra acquires interest in Luangue project from XceldiamLuangue borders Alto Cuilo and may host similar kimberlite geologyPetra’s objective is to fast track Luangue based on Alto Cuilo experienceConsolidates Petra’s position in the diamond belt of Angola

Angola – Project Luangue

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Corporate

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Shares in issue 181 million

Fully diluted shares in issue 209 million

Market cap £246 million

12 month high/low 167.0p – 82.0p

Production year to June ‘06 175,011 carats

Revenue year to June ‘06 US$20.8 million

Cash US$45 million

Corporate - financial snapshot(as at 23 July ‘07)

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Botswana

Andrew Rogers – Group Geologist

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Botswana – Petra licence areas

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Sekaka Diamonds has approx. 52,000km2 of highly prospective diamond exploration ground in BotswanaBotswana is the world’s largest producer of diamonds by valueSekaka has 30 known kimberlites in its licence areasKimberlite Go173S – detailed exploration indicates substantial increase in size of kimberlite.Kimberlite X25 discovered on ground previously covered by other companiesOther highly prospective anomalies for further investigation, with technical support from BHP Billiton

Botswana Exploration – SekakaDiamonds

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Gope and Kukama Project Areas

GOPE

KUKAMA

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SEKAK A DIA MON DS (P TY) LT DGOPE DRILL TAR GETS - OCT OBER 2006

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Gope and Kukama – KIM Haloes and known Kimberlites

Go 25Go 130

TB4Go 173S

Ki01

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SEKAK A DIA MON DS (P TY) LT DGOPE DRILL TAR GETS - OCT OBER 2006

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Gope – KIM Halo and known Kimberlites, Target of airborne geophysical survey

Go 25Go 130

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Gope – 1st Pass Target Selection

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Gope – Ground Follow Up

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SEKAK A DIA MON DS (P TY) LT DGOPE DRILL TAR GETS - OCT OBER 2006

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Gope – Drilling Targets

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SEKAK A DIA MON DS (P TY) LT DGOPE DRILL TAR GETS - OCT OBER 2006

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Gope – Kimberites Found

X25

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X25 – Previous Magnetics (RTP)

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SEKAK A DIA MON DS (P TY) LT DGOPE DRILL TAR GETS - OCT OBER 2006

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X25 – Hi Res. Magnetics (RTP)

X25

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X25 – Hi Res. Magnetics (enhanced)

X25

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X25 – Kimberlite Intersection

X25 – Percussion Drilling and Air Flush Coring

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X25 Results

Magmatic, macrocrystic, Group 1 kimberlite(Skinner, 2006)Ilmenite deficientLow concentrations of DSF kimberlite indicator mineralsCPX thermobarometry and garnet geochemistry indicates high level of thermal perturbation and mantle metasomatism – poor diamond potentialNo further work planned

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Gope – Further Work

Known kimberlites do not explain historical KIM anomalyFurther drilling of targets delineated by ongoing ground geophysical follow-upNew target generation exercise in light of X25 discovery (subtle anomalies not detected by previous exploration).

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Kukama – KIM Halo and known Kimberlites

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SEKAK A DIA MON DS (P TY) LT DGOPE DRILL TAR GETS - OCT OBER 2006

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0 10 205Kilometers

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TB4

Go173S

Ki1

Kukama

Kimberlites

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1000m

3000m

Go 173 Cluster Ground TMI

Kukama - Known Kimberlites

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Gope 173 Cluster Discovery History

1997 - Discovery of four kimberlites by TNK Resources Inc in Kukama Region

1998 – TNK concludes JV agreement with De Beers Prospecting Botswana (Pty) Ltd (“Debot”)

Debot undertakes a work program which includes additional soil sampling, geophysics, drilling and mini-bulk sampling over the above mentioned kimberlites

End of program results:

21,6421,890191GP 234

24,9060,47072GP 211

21,9140,3308smallGO 173S

50,5080,41563GO 173N

Sample weight treated (tons)

Macrodiamondsrecovered (carat)

Macrodiamondsrecovered (number)

Size (Ha)Kimberlite

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Kukama Cluster Kimberlites - Ground Gravity and Magnetic Follow-up

Go173 N

Go173 S

Go211

Go234Go211&Go234

Go173 S

Go173 N

Gravity - Residual Magnetics – Analytic Signal

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Go173S: Kimberlite Intersections –March 2007

Go173 STNK Discovery Intersection

TNK/De Beers Diamond Borehole

BH GO173S/H8

BH GO173S/H9

Bouguer Gravity – 1st Vertical Derivative

Go211

Go234

TNK/De Beers RC Boreholes (K/B – EOH Lithology)

Gravity Model Contours

100m

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Go 173 – Gravity Model

Complex 3D morphology

Estimated size of Go173S – 25 Ha.

Profiles indicate Go211 may be linked to Go173S (considerable upside potential for body size)

G0173S

Go211

G0173SGo211

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Kukama Further Work -2008 Proposed Aeromagnetic Flight Block

10 km

+- 52,000 lkm

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Mabutsane Project Area

MABUTSANE

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Kukong – Mabutsane Block Magnetics: TMI

10 km

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Mab306 Geophysical Signature

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mGal

Eo

Low density crater facies2.25 g/cc

Waterberg and Olifantshoek sequences2.75 g/cc

Karoo sandstones and shales2.5 g/cc

Zoetfontein Fault system

Karoo Basalt 2.85 g/cc

1000m

500m

0m

Magnetic Body (possible RVK on

edge of crater?)

MeasuredGz Model response

Gz

MeasuredGzz

Model responseGzz

Mab306 Conceptual model derived from Geophysical modeling

Mab306/H2Mab306/H1

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Drill Results

Base of Kalahari intersected at 51mEcca group intersected at 106mDolerite intersected from 133m to EOH at 198mMagnetic anomaly explained by intrusive doleriteDeepen original hole to past base of Karoo

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Orapa North Project Area

Orapa North

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Orapa North Block Magnetics: TMI

10 km

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Botswana Exploration – SekakaDiamonds

Sekaka’s 2007/2008 work programme:

Follow up on the Go 173S, 600 metre diameter gravity anomaly and associated kimberlite (larger than previously accepted)

Kimberlite X25 discovered – further work planned for the area

Investigation into 20 high priority targets from recent Xcalibur survey at OrapaNorth

New high-resolution magnetic flight blocks over Kukama and Kauduma localities

Ongoing detailed investigation of known diamondiferous kimberlites in the Kukama Cluster and at Jwaneng (DK4 and DK6).

Investigation of any further kimberlites discovered in the Gope area.

Re-evaluation of accumulated geophysical data

www.petradiamonds.com

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