Originally Posted by Oracle_Hunter
Obligatory "What Edition/Game?" Post
There was never a "basic gemstone" pricing chart. They were usually worth somewhere between 50-100 GP apiece with some at 500 GP or 1000 GP.
AD&D had a table which linked various types of precious and semi-precious stones to certain ranges of GP value. AFAIK none of the WotC Editions have such a table.
Forgotten Realms did have it's own table.
And I believe Magic Item Compendium
merged gems with art items- and gave examples of appropriate items.
Art maxes out at 12000gp, Gems max out at 8000gp- but the MIC combined items table maxes out at 16000 gp.
One of the things that annoyed me about Gem golems in Monsters of Faerun, was that they need a single 10000 gp stone as the base on which to build the rest of the golem- but normally you can't find stones that size.
The MIC rules could be used to justify 10000-16000gp gemstones.