Herderite is a rare collector’s gem, especially in larger sizes. Although too soft for daily jewelry wear, this material is […]

Massive hemimorphite can have a very delicate, blue color. However, it’s seldom cut because not very much has appeared on

Hematite has a long history of use as a pigment. As a gemstone, this material is often carved but very

Heliodor is a member of the beryl family. This stone is known for its range of yellow colors — from pale yellow,

One of the major mineral constituents of lapis lazuli, haüyne is rarely found and faceted as a distinct gemstone. Collectors

Although hard enough for jewelry use, rare hambergite is a gem for collectors of the unusual. Its combination of high

Gypsum is one of the most abundant minerals, but gem-quality crystals are very rare. This material is extremely difficult to

Grossular garnets come in almost every color, even colorless, except blue. However, unlike other garnets, they’re rarely red or dark.

Green diamonds are the oddballs of the fancy colored diamond varieties. Their rare color is usually the result of damage

Diamonds with a pure gray hue are a rare treasure indeed. More often, gray is mixed with blue or violet