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Reference Values of Gems
Database updated: 1 May 2016
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Iolite: average retail prices, May 2016


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Valuation date: 25 May 2016
Value chart for Iolite. Data valid till: 08 Jun 2016
Values in USD per carat; ref. clarity = VVS, ref. cut = Excellent

Color Color Description; Occurrence 1 ct. 3 ct. 5 ct. 10 ct. 30 ct.
dark Bluedark Blue
Alternative name, occurrence category: Common
66.0897.40128.72207.01No data
161 - medium violetish Blue; very slightly greyish161 - medium violetish Blue; very slightly greyish
Alternative name, occurrence category: Cordierite. Common
81.83120.61159.39256.34No data
159 - medium light violetish Blue; very slightly greyish159 - medium light violetish Blue; very slightly greyish
Alternative name, occurrence category: Cordierite. Common
56.2782.94109.61176.28No data
157 - light violetish Blue; strong157 - light violetish Blue; strong
Alternative name, occurrence category: Cordierite. Common
41.5061.1680.83129.99No data
223 - colorless223 - colorless
Alternative name, occurrence category: Cordierite. Rare
79.51117.19154.86249.06No data

Color grades system


Approximate clarity factors:

Clarity grade VVS VS SI1 SI2 I1 I2 I3 OPQ
Value factor1.0000.9430.8740.7310.6040.396------

Clarity grade patterns


Gemstone Appraisal:  Iolite  

Value Charts: printable version  

Gems info: Iolite  


 
 
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