gemstone price per carat list
Sphene Prices. Sphene can vary widely in price as a cut gemstone. Prices (Feb 2011) can range from $10-$100 per carat for small stones, but larger sphenes are less common and it's possible for a sphene over 10 carats, with strong brilliance and fire, to reach $400 per carat. $200 per carat is not that uncommon.