Sunstones contain hematite or goethite inclusions, which reflect light in parallel orientation and create a sparkling sheen in gold to […]

Although sulfur is very abundant, facetable material is not. Sulfur is also enormously difficult to cut and almost impossible to

What is the color of sugilite? Grape jelly purple is a good description. More popular among consumers in Asia than

Strontianite is a collector’s oddity, with no spectacular properties to recommend it. Colors are usually pale and there is little

Stolzite is a rare mineral; much rarer than wulfenite and usually occurs in very minute crystals. However, the Australian crystals

Stichtite is not facetable, but the pink color is quite striking in cabochons. Cut stones are especially beautiful when there

Rare stibiotantalite possesses an interesting mix of physical and optical properties that help distinguish it from other earth-toned gemstones. However,

Staurolite crystals in opaque cross shapes are popular gemstones. However, this material is very rarely transparent or facetable. These dark

Star sapphire is a type of sapphire that displays asterism, a star-like optical effect.

An attractive but uncommon mineral, spurrite has seldom been cut as a gemstone. However, it has the hardness and tenacity