Of the 5500 described mineral species, approximately 200 have been faceted. Only about 25 of those are used for jewelry purposes. What about the other 175? John covers some of the rarer gemstones in the jewelry market.
Of the 5500 described mineral species, approximately 200 have been faceted. Only about 25 of those are used for jewelry purposes. What about the other 175? John covers some of the rarer gemstones in the jewelry market.