Diamonds • Precious Gemstones • Jewelry • Gemology

The Final Grade - Pulling it All Together

At this point, if we have followed the procedures faithfully we will have determined grades for

Brilliance
Saturation & Tone
Clarity
Cut

So we can add those grades and divide by four to get a Composite.

[Clarity + Brilliance + Saturation & Tone + Cut] / 4 = Composite

While this method may seem overly simplistic, there are so many interrelationships it tends to work.

Our Grade *compared to some other systems.
Composite	1-2	3-4	5-6-7	8-9	10
Asia-Gems.com	1	2	3	4	5
Hughes	Poor	Fair	Good	Very Good	Exceptional
AIGS	1	2	3	4	5
Common in US	Commercial	Standard	Good	Fine	Extra Fine
Common in Asia	Commercial	A	AA	AAA	Gem Quality
Extending The Range of Single Grades - Grades represent ranges. Two gems may fall into the same grade but one, being closer to the top of the range, may be worth more than a gem falling at the bottom of a range. One way to mitigate this situation is by using a modifier. A gem at the top end of Grade 4 could be designated +4, while a lower end gem would be -4. So we can essentially split each grade into 3 parts (-4, 4, +4). *approximately and as we understand them

Asia Gems

Diamonds

Jewelry

Gemstones

Pearls

Gem Basics

Gemology

Grading

Cut & Proportion
Brilliance/Luster
Color/Hue
Saturation & Tone
Clarity
Gem Grade