Compare GIA certified diamonds

GIA certified diamonds with similar grades are rarely equal in value.

Example 1:

Comparison of similar Cushion cut GIA Certificates by Ascot Diamonds New York, D.C., Dallas and Atlanta


Based on the GIA certificates alone, the 1.71 F/VS2 diamond on the left should be more valuable than the 1.70 G/SI1 on the right.

Side by side comparison clearly shows that the 1.70 G/SI1 on the right has a better cut, larger face and is easily the more brilliant and valuable diamond.

GIA Diamond grades alone are not a reliable indicator for brilliance, cut or value.


Example 2:

The diamonds below both have identical GIA grades

Color: I / Clarity: VS1 / Polish: Excellent / Symmetry: Excellent / Cut: Excellent

Why is diamond ‘B’ approximately 20% more valuable than diamond ‘A’?

Comparison of 2 similar GIA certificates

1. Better proportion and ‘face size’.

Diamond B = 7.58mm – Diamond A = 7.41mm

2. Diamond B on the right is slightly whiter even though both diamonds are graded GIA color ‘I’.

Color variations in diamonds with the same GIA or EGL US certificates is not unusual and must be taken into account when calculating correct value.

3. The inclusions in diamond A are located in the center of the diamond [circled].

In diamond B the inclusions are smaller, located towards the outside edge [circled bottom left] and represent a better example of the VS1 clarity grade.

At Ascot every diamond is scrutinized for brilliance, proportion and correct value before being added to our inventory; less than 5% of all diamonds produced meet Ascot’s demanding standards.

We invite you to visit Ascot in New York, Dallas, D.C. or Atlanta where in a dignified atmosphere clients receive a priceless education, competitive prices and compare diamonds from ‘the most meticulously selected diamond inventory in the world.’

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