Out of respect for Her Late Majesty Queen Elizabeth II, the Lab will be closed on Monday 19th September.

Diamond certification is the written proof of a diamond's attributes

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agi Gem Encyclopedia is a virtual journey through the science and lore of gemstones from across the globe

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Learn more about synthetic diamonds and where they come from.


agi offers a range of certification services, including a customised diamond sealing service and valuation reports, all of which are graded according to industry standards agi is the first international diamond laboratory to open a dedicated diamond grading and valuation laboratory in the UK to provide its high class service and superior turnaround times to the UK Jewellery market, established in the UK in 2000.

agi has been at forefront of diamond grading and certification since it’s inception almost 50 years ago, helping our customers achieve their goals. With over 13,000 clients across three continents, agi is the name trusted by the diamond industry for over fifty years

Our Service

Advanced diamond grading laboratory

Enjoy peace of mind as you appreciate the beauty of your diamonds with an agi reports. Our innovative and comprehensive analysis will ensure you know exactly what your items worth.

Get to know your Diamonds

Featured Gems


Opal’s shifting play of kaleidoscopic colors is unlike any other gem.



Amber is nature’s time capsule. This fossilized tree resin contains remnants of life on earth millions of years ago.



Diamonds are among nature’s most precious and beautiful creations.



Sunstone’s phenomenal varieties show a distinct and lively glitter called aventurescence.


Fancy Colour Diamonds.

Dazzling brilliance. Captivating color. The planet’s most valued gems are fancy colour diamonds.

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