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Reference Values of Gems
Database updated: 15 Jan 2017
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GVA basis set

Gemval Aggregate index (GVA) is calculated as a total value of 26 gemstone standard specimens (the GVA Basis Set) and represents overall pricing trend in the jewelry market.
We monitor GVA values since 1st July 2005. The current value of GVA is measured in %, as a ratio of current GVA value to the initial value on July 2005.

Gemstone type: Weight, cts: Color code and description:
Alexandrite   2.00 125 / 203 - color change: medium Green-Blue or Blue-Green; very slightly greyish / medium reddish Purple; very slightly brownish
Amethyst   16.00 186 - medium dark bluish Purple; strong
Aquamarine   10.00 121 - light Green-Blue or Blue-Green; strong (unheated)
Beryl   16.00 187 - very light Purple
Chrysoberyl   10.00 057 - medium light greenish Yellow; very slightly greyish
Citrine   16.00 046 - medium light Yellow; strong
Demantoid   3.00 086 - medium Green; very slightly greyish
Emerald   3.00 100 - medium dark very slightly bluish Green; strong
Hessonite   7.00 025 - medium reddish Orange; strong
Iolite   3.00 161 - medium violetish Blue; very slightly greyish
Kunzite   16.00 181 - light bluish Purple; strong
Kyanite   7.00 160 - medium violetish blue; strong
Peridot   7.00 078 - medium dark slightly yellowish Green; strong
Rhodolite   7.00 221 - medium slightly purplish Red; very slightly brownish
Ruby   2.00 211 - medium strongly purplish Red; strong (Burma, heated)
Ruby   2.00 220 - medium slightly purplish Red; strong (Africa, heated)
Sapphire   3.00 151 - medium Blue; strong (heated)
Sapphire   3.00 016 - medium orangey Red; strong (heated)
Sapphire   3.00 185 - medium bluish Purple; very slightly greyish (heated)
Spessartite   7.00 025 - medium reddish Orange; strong
Spinel   7.00 153 - medium Blue; very slightly greyish
Tanzanite   7.00 169 - medium bluish Violet; strong
Topaz   16.00 148 - medium light Blue; strong
Tourmaline   16.00 088 - medium dark Green; strong
Tsavorite   3.00 088 - medium dark Green; strong
Zircon   7.00 115 - medium very strongly bluish Green; strong


 
 
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