Welcome to Gemstone Auctioneers
Here at Gemstone auctioneers we understand the importance of providing the very latest, up to date valuation for all our gemstones, The importance of being accurate with the valuation along with the historical values charts ensures that when we quote an average retail value the valuation is as current as is possible.
Interactive online gem appraisal model
To provide you with the most accurate online appraisal possible, we have created a sophisticated mathematical model. Each gemstone appraisal is based on a complex statistical analysis of current online sales prices for natural coloured gems. The algorithm takes into account the specific factors influencing a gem's price, such as; weight, colour, clarity, cut and shape. We collect statistical market data by examining hundreds of lots from different gem sellers every month. Please be aware that the pricing model parameters (value factors) are generally updated monthly, so any estimated value will vary slightly over time.
How we collect data
We add new online shops to our tracking list every month so our online gemstone resources are continuously growing. We thoroughly check and categorize each online resource before we assign it a value on our dependency index. To optimise accuracy we make sure that only market-
Gemstone dealers are more than welcome to contact us and be included in our tracking list free of charge.
Generally speaking, the value of any natural gemstone may be approximated by using the following formula:
Val = (L0 + L1 * W) * W * C1 * C2 * C3 * C4
L0, L1 -
The values of relevant coefficients are derived by the 'Least Square Method'. Currently our statistical database contains over 70000 records, and as a rule we upload new records to our database and recalculate the coefficients on a monthly basis.
Brief history of Gemval
A group of gemologists and mathematicians started work on a web-
Gemval.com is launched, and 480 new users registered during its first week online!
Open Alias Corporation acquires Gemval.
Gemval offers a paid-
Gemval is the first to market. We begin to publish historical-
Gemval appointed as an approved data supplier for the provision of valuation data and pricing indices for the Market News Service, The International Trade Centre UNCTAD/WTO, Geneva.
Gemval extends its statistical database, with specific color pattern parameters added for the rare gemstone varieties.
Gemval develops the color grading system and valuation model for precious opals. Gemval releases a diamond valuation service online.
Gemval serves 1500-
The valuation of every Gemstone is important, We offer the very latest up to date valuation, this enables everyone to see the “Average Retail Value” of the gemstone.
With Gemval we as a company, and you the customer, are assured that the valuation is current for the particular month of the year of the valuation.