GIA Certified Diamonds

Browse our collection of GIA certified diamonds. The Gemmological Institute of America standardized the diamond grading scale. Each of our GIA certified diamonds is accompanied by an internationally respected grading of the Four Cs. Choose your expertly graded diamond for your dream diamond ring, engagement ring or wedding ring in confidence.  

Established in 1931, the Gemmological Institute of America is seen as one of the leading diamond and gemmological laboratories worldwide. The GIA invented the process of assessing diamonds via the Four Cs in the 1940s, and was the first laboratory to issue diamond grading reports in 1953.

The GIA grade loose diamonds in order to assess the cut, colour, clarity and carat weight of each stone. These stringent quality checks in laboratory conditions allow buyers to compare diamonds from an unbiased and verifiable grading system. The GIA diamond grading report is a highly respected and official document detailing the quality of the diamond, allowing you to purchase in confidence.

For further information on any of our GIA certified diamonds, contact our diamond experts by calling 01335 453 453 or email us at