AGI

AGI agi has been at forefront of diamond grading and certification since its inception almost 50 years ago, helping our customers achieve their goals.

We are uniquely positioned to provide you with a superior service and a quality report which will help achieve more sales and boost customer confidence by providing you with an expert, unbiased third-party report to verify the quality of the diamond you are selling. With an agi diamond grading report you are not only receiving a diamond document from a premier diamond grading laboratory, but you a

re assured that you are selling an appropriately valued diamond graded with the gemmological industry's highest standards of evaluating the 4 C's.

💎 Fun Fact :Diamonds can survive a billion years underground…And apparently AGI can survive a few years off Social media...
02/12/2025

💎 Fun Fact :
Diamonds can survive a billion years underground…
And apparently AGI can survive a few years off Social media 😅

We’re back — refreshed, upgraded, and ready to share real lab insights, gem tips, and all things certification.

Thanks for being here. Let’s do this 💙

Welcome to AGI Gems!We’re an independent gemstone and diamond certification laboratory dedicated to accuracy, transparen...
26/11/2025

Welcome to AGI Gems!

We’re an independent gemstone and diamond certification laboratory dedicated to accuracy, transparency, and trust.

Every report we issue represents our promise of impartial grading — powered by science, experience, and integrity.

Whether you’re a jeweller, collector, or gem enthusiast, we’re here to bring clarity and confidence to every stone.

🔬 Independent. Accurate. Trusted.

Confused about colours?Check out our simple colour charts.
11/05/2016

Confused about colours?
Check out our simple colour charts.

29/04/2012

Have you seen our new Gem Reports? Get accurate information on your gem stones. www.agigems.com

12/03/2012

We are now offering Diamond Information Classes - contact us for more information on them - Make sure you know what you are buying!

01/11/2011

agi UK - Make sure your jewellery valuations are up to date, prices have risen very sharply over the last 2 years of gold and diamonds. http://www.agigems.com

01/11/2011

agi New York launches Hearts & Arrosw Certificate

Address

Vangate House, 21 Bury Old Road
Manchester
M250EY

Opening Hours

Monday 9:30am - 3pm
Tuesday 9:30am - 3pm
Wednesday 9:30am - 3pm
Thursday 9:30am - 3pm
Friday 9:30am - 12pm

Telephone

+441617204406

Website

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