A rather rare mineral, lovely blue-green grandidierite is seldom seen in gem or jewelry collections. Translucent material is sometimes cut […]

This mineral is very hard to cut because of extreme softness and cleavage. Gaylussite dries out slowly in air and

Discover the diverse world of garnet gemstones beyond the familiar red. From rare green garnets to color-changing varieties, explore garnet

Gahnospinel is a solid-state solution between spinel and gahnite.

This is not a terribly attractive gemstone, but faceted gems would be a tremendous rarity. The material is quite brittle,

Friedelite is not abundant, and gem-quality material is rarely seen even in large collections. Faceted gems are true collector’s items.

Like their marine cousins, many freshwater mollusks can produce pearls. However, this rarely occurs in nature. Today, the majority of

Although too fragile for most jewelry use, fluorites are often faceted for collectors. They occur in a wide range of

This mineral is not abundant and is known from various localities. Cabochons are cut merely as curiosities, as they have

Feldspars are the most common minerals at the Earth’s surface. In fact, if the entire composition of the Earth’s crust