gemval.com
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Reference Values of GemsDatabase updated: 2 Aug 2016Sign upLog inGemstone AppraisalValue ChartsHistorical ValuesOccurrenceGems Info Utilities Contacts Online gemstone appraisal Gemval provides you web tools for gemstone appraisal, whereby most natural gemstones can be valued using our interactive model. To arrive at the value our statistical model takes into account the many factors contributing to gem's value. Factors such as the stone's variety, carat weight, color, saturation, clarity and others are all used in the calculation. The value displayed by the model represents average market prices for the stone as of the date of appraisal. Gemstone price calculator Current market prices of gemstones Carat value charts published by Gemval represent average retail prices of natural gemstones. We update our value charts on a monthly basis. Gemstone value charts Gemstone color grading The color grade matrix is the core of the Gemval online appraisal system. It consists of 230 color patterns, 25 base hue sets and a grey scale. This is extended by 6 tone levels (very light, light, medium light, medium, medium dark and dark) and by 3 saturation grades (strong, very slightly greyish-brown and slightly greyish-brown). Color grade system Color grades for Opals Service news and upgrades log June 30, 2016 Alexandrite, Chrysoberyl, Demantoid sections updated. June 28, 2016 Ruby and Sapphires sections updated. March 31, 2016 Opal (Australia) and Opal (Ethiopia) sections updated. Previous events Gemstone market average index (GVA) for the past 12 months. Historical Prices and the Gemval Aggregate Index We have monitored and recorded historical prices for natural gemstones since the 1st of July 2005. The Gemval Aggregate index (GVA) is updated monthly on the basis of calculated values and past statistics. GVA reflects the overall pricing trends for natural colored gemstones. Historical data charts Gemval Aggregate Index Subscription We grant our visitors free access to most gemstone pricing data. However access to data is reserved for subscribers on the following stones: - Alexandrite - Diamond, Fancy Diamond - Emerald - Opal (Australia, Ethiopia) - Ruby (heated / unheated) - Sapphire (heated / unheated) - Spinel & - Tanzanite Subscription fee: $24.00 - 1 month $38.00 - 3 months $54.00 - 6 months $82.00 - 1 year. As a subscriber, you'll have access to all of Gemval's functions and, of course, you will benefit from our highest priority customer service. To subscribe please register and login Refund Policy Testimonials Color grading system Color system for opals Clarity grades Gems info How it works FAQ Interviews Testimonials Updates Partners Privacy Policy Disclaimer Site Map About us Contacts ©2004-2016 Gemval.com
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