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Reference Values of Gems
Database updated: 2 Aug 2016
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Iolite: average retail prices, Aug 2016


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Valuation date: 29 Aug 2016
Value chart for Iolite. Data valid till: 12 Sep 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
65.4397.57129.71210.06No data
161 - medium violetish Blue; very slightly greyish161 - medium violetish Blue; very slightly greyish
Alternative name, occurrence category: Cordierite. Common
81.02120.82160.62260.12No data
159 - medium light violetish Blue; very slightly greyish159 - medium light violetish Blue; very slightly greyish
Alternative name, occurrence category: Cordierite. Common
55.7283.09110.46178.88No data
157 - light violetish Blue; strong157 - light violetish Blue; strong
Alternative name, occurrence category: Cordierite. Common
41.0961.2781.45131.90No data
223 - colorless223 - colorless
Alternative name, occurrence category: Cordierite. Rare
78.72117.39156.06252.73No 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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