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Reference Values of Gems
Database updated: 1 Aug 2015
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Iolite: average retail prices, Sep 2015


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Valuation date: 01 Sep 2015
Value chart for Iolite. Data valid till: 15 Sep 2015
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
66.8998.30129.71208.23No data
161 - medium violetish Blue; very slightly greyish161 - medium violetish Blue; very slightly greyish
Alternative name, occurrence category: Cordierite. Common
97.06142.63188.21302.14No data
159 - medium light violetish Blue; very slightly greyish159 - medium light violetish Blue; very slightly greyish
Alternative name, occurrence category: Cordierite. Common
62.7992.27121.75195.45No data
157 - light violetish Blue; strong157 - light violetish Blue; strong
Alternative name, occurrence category: Cordierite. Common
48.2470.8993.54150.17No data
223 - colorless223 - colorless
Alternative name, occurrence category: Cordierite. Rare
108.08158.82209.57336.43No 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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