A beautiful but rare mineral, kämmererite is extraordinarily difficult to facet. As a result, the availability of cut gems is […]

Kyanite’s physical properties make it very difficult to facet. However, it’s a popular collector’s gem, especially in sapphire-blue colors.

Kurnakovite is difficult to cut, inadvisable to wear, and usually colorless. Consequently, faceted specimens are extremely rare.

Star kornerupine also has been found (Mogok, Myanmar) but is very rare. Kornerupine is generally dark brown or green and not very

Historically a popular black gem, jet has declined in popularity in modern times. Although jet jewelry has been long associated

Jeremejevite would make a durable and attractive jewelry stone, but this rare mineral occurs even more rarely as facetable material.

Jasper is an opaque, solid or patterned variety of cryptocrystalline quartz. All types of jasper take an excellent polish, are

Explore jadeite gemstone value, learn the facts about jadeite vs jade, and discover how to identify quality jadeite jewelry.

Inderite is very soft and difficult to cut, and only a few stones have been cut by hobbyists. There is

Idocrase is one of the lesser known and more beautiful collector gems. When properly cut it is as bright and attractive