List of Gemstones: Precious and SemiPrecious Stones
The beryls are among the most popular, and also the most expensive, of all gems. A wide range of col ... View Profile Beryllonite Difficult to facet and typically colorless, beryllonite is a rare collector's gem. Some specimens ca ... View Profile Bismutotantalite Extremely rare as a cut gem, even in very complete collections.