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Reference Values of Gems
Database updated: 26 September 2017
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Iolite: average retail prices, Oct 2017


Select gemstone type:

Valuation date: 19 Oct 2017
Value chart for Iolite. Data valid till: 02 Nov 2017
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
61.8392.58123.33200.20No data
161 - medium violetish Blue; very slightly greyish161 - medium violetish Blue; very slightly greyish
Alternative name, occurrence category: Cordierite. Common
76.56114.64152.71247.90No data
159 - medium light violetish Blue; very slightly greyish159 - medium light violetish Blue; very slightly greyish
Alternative name, occurrence category: Cordierite. Common
52.6578.84105.02170.48No data
157 - light violetish Blue; strong157 - light violetish Blue; strong
Alternative name, occurrence category: Cordierite. Common
38.8258.1377.44125.71No data
223 - colorless223 - colorless
Alternative name, occurrence category: Cordierite. Rare
74.39111.38148.38240.87No 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  

Gems info: Iolite  


 
 
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