Holding(s) in Company

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached:

DIAMONDCORP PLC

2 Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

X

An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights

Other (please specify):

3. Full name of person(s) subject to the notification obligation:

CREDIT SUISSE GROUP AG

4. Full name of shareholder(s)  (if different from 3.):

CREDIT SUISSE SECURITIES (EUROPE) LTD

5. Date of the transaction and date on which the threshold is crossed or reached:

31.03.2010

6. Date on which issuer notified:

1.04.2010

7. Threshold(s) that is/are crossed or reached:

3%

8. Notified details:

A: Voting rights attached to shares

Class/type of shares

if possible using the ISIN CODE

Situation previous to the triggering transaction

Resulting situation after the triggering transaction

Number of Shares

Number of Voting Rights

Number of shares

Number of voting rights

% of voting rights

Direct

Direct

Indirect

Direct

Indirect

ORD

GB00B183ZC46

1,440,000

1,440,000

N/A

N/A

Not Reportable

N/A

Not Reportable

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date

Exercise/ Conversion Period

Number of voting rights that may be acquired if the instrument is exercised/ converted.

% of voting rights

N/A

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments xv, xvi

Resulting situation after the triggering transaction

Type of financial instrument

Exercise price

Expiration date

Exercise/ Conversion period

Number of voting rights instrument refers to

% of voting rights

N/A

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

Not Reportable

Not Reportable

9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable:

1. Credit Suisse Group AG

2. Credit Suisse AG

2.1. Credit Suisse Securities (Europe) Ltd

Proxy Voting:

10. Name of the proxy holder:

11. Number of voting rights proxy holder will cease to hold:

12. Date on which proxy holder will cease to hold voting rights:

13. Additional information:

14. Contact name:

Simon Crawley/Carolyn Collins

15. Contact telephone number:

+44 (0) 20 7888 5416

Note: Annex should only be submitted to the FSA not the issuer

Annex: Notification of major interests in shares

A: Identity of the persons or legal entity subject to the notification obligation

Full name

(including legal form of legal entities)

Credit Suisse Group AG

Contact address

(registered office for legal entities)

One Cabot Square, London E14 4QJ

Phone number & email

020 7888 5416 [email protected]

Other useful information

(at least legal representative for legal persons)

Simon Crawley

B: Identity of the notifier, if applicable

Full name

Contact address

Phone number & email

Other useful information

(e.g. functional relationship with the person or legal entity subject to the notification obligation)

C: Additional information

Our ref: 378179

For notes on how to complete form TR-1 please see the FSA website.