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Certificate questions/HCA

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curiousone

Rough_Rock
Joined
Mar 25, 2003
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6
Hello once again to all you diamond gurus out there. Just two questions for you guys this time.

1. I could be reading this wrong but can someone explain to me why the diameter report from the GIA is different from the Sarin report? The GIA certificate says it is 7.14 - 7.18 x 4.37 mm. The Sarin report says 7.22 (7.20 - 7.23).

2. When using the HCA, I get better results using the crown/pavilion % then when using the angle. Shouldn''t it be the same? If not, which is more reliable?

Thank you in advance for your help
wavey.gif
 

Mara

Super_Ideal_Rock
Joined
Oct 30, 2002
Messages
31,003
Not too sure about the GIA vs Sarin though I do know that sometimes they do not match.

On the % vs angles, the angles are more *accurate* but the % will give you a better score because they use an RANGE of numbers as opposed to the actual angle. Use the angles..the % will not give you an accurate idea of how the stone will perform.
 

DiamondOptics

Shiny_Rock
Joined
Jun 27, 2002
Messages
380
Hi curiousone,


You should expect a small difference between the GIA report and the sarin analysis in many cases.

GIA uses a hand held guage to measure the diameter
of a diamond, while the sarin is a computerized devise
which takes measurements.

As for the HCA, I believe it is mentioned that the angles
are more accurate than the percentages.

kirk
 
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