Block listing six monthly return

Pursuant to Listing Rule UKLR 20.6.6, Gem Diamonds Limited makes the following update on its block listing:

Name of applicant: Gem Diamonds Limited
Name of scheme: Gem Diamonds Employee Share Plan 2017
Period of return From: 19 June 2025 to 19 December 2025
Balance of unallotted securities under scheme(s) from previous return: 1,565,271
Plus: The amount by which the block scheme(s) has been increased since the date of the last return (if any increase has been applied for): 0
Less: Number of securities issued/allotted under scheme(s) during period (see UKLR20.6.7G): 26,250
Equals:  Balance under scheme(s) not yet issued/allotted at end of period: 1,539,021

The Gem Diamonds Limited LEI number is 213800RC2PGGMZQG8L67.

FOR FURTHER INFORMATION:

Gem Diamonds Limited
Kiki Constantopoulos, Company Secretary
ir@gemdiamonds.com

Celicourt Communications
Mark Antelme / Charles Denley-Myerson
Tel: +44 (0) 207 777 6424

ABOUT GEM DIAMONDS:

Gem Diamonds is a leading global producer of high value diamonds. The Company owns 70% of the Letšeng mine in Lesotho. The Letšeng mine is famous for the production of large, exceptional white diamonds, making it the highest dollar per carat kimberlite diamond mine in the world.