Gemstone color grading

The color grade matrix is the core of the Gemval.com online appraisal system. It consists of 230 color patterns, 25 base hue sets + grey scale, extended by 6 tones (very light, light, medium light, medium, medium dark, dark) and by 3 saturation grades (strong, very slightly greyish/brownish, slightly greyish/brownish).

Historical prices and Gemval Aggregate

We have monitored the historical prices for natural gemstones since 1st July 2005. The Gemval Aggregate index (GVA) is updated and published monthly, on the base of calculated values and past statistics. GVA reflects the overall pricing trends for natural colored gemstones.

Historical data charts

Gemval Aggregate index

Weight distribution analysis, 2009

Market News Service

Our Clients

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Featured resources

GemsDB.com: The World's largest online database of natural gemstones. Hundreds of dealers have listed their stocks with us.

Diamondse.info: Weekly updated diamond pricing trends and diamond grading reports. A searchable database of diamond prices from online jewelers.

Full membership

We grant our Clients free access to most gemstone valuation data. However, access to data on the following:
- Alexandrite
- Emerald
- Ruby (heated / unheated)
- Sapphire (heated / unheated)
- Spessartite
- Spinel
- Tanzanite
- Tsavorite
is reserved for subscribers only.

Subscription fee:

$30.00 - 3 months;
$50.00 - 6 months;
$80.00 - 1 year.

As a subscriber you can access all Gemval.com functions, including Value Charts, Personal Collection Monitor and, of course, you will benefit from our highest priority customer service.

To subscribe please register and login