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Mellite is a rare and unusual organic gemstone. This variety of gem-quality chrysoberyl makes an excellent jewelry stone. This makes phosphophyllite one of the more desirable — and expensive — collector’s gemstones. Translucent material is sometimes cut into cabochons. Forming series with pyrope and spessartine garnets, these gems occur in the deep brownish or purplish reds most often associated with garnets.   |   It is a bit too soft for average wear, but its distinctive color is worthy of jewelry. Probably fewer than a dozen creedite gems have ever been faceted. Agate is a variety of microcrystalline quartz. Cabochons are cut merely as curiosities, as they have no special features that would recommend them except rarity. However, these rare gems are seldom transparent and are usually found as very small crystals. However, this material is very rarely transparent or facetable. Recently, this gemstone has seen an increase in popularity and value. Small, cuttable crystals of very rare zektzerite are found only in a mountainous location in Washington state.

With light blue and green colors, no cleavage, and high hardness, boracite is an uncommon mineral. Star kornerupine also has been found (Mogok, Myanmar) but is very rare. Large faceted stones are often flawed, but smaller cut gems can make beautiful jewelry pieces. Bornite is too soft and brittle for anything but a collector curiosity, although cabochons are quite attractive when they tarnish.
In reflected light, they have a dark gray, metallic luster. Faceted magnesite is rarely seen, but cabochons are more common. Iolite with hematite inclusions (bloodshot iolite) comes from Sri Lanka. Usually colorless, cut stones have little fire but can be very bright. Faceted gems even as small as 1 carat are considered great rarities. Andesine’s occurrence is widespread throughout the world, in a great variety of rock types and environments, but in most cases transparent crystals are rare. Faceted pieces are very rare, but recent discoveries of transparent material may bring more to the market. Easy to cut but too soft and fragile for jewelry, a faceted witherite would make an unusual addition to a gem collection. Cut stones are infrequently seen and are cut only as a curiosity by the collector who wants to have one of everything. Dumortierite is a beautiful and very hard material, eminently suitable for jewelry. With beautiful green to blue-green colors and interesting patterns, variscite is a popular hobbyist material for cabochons.

The epidote mineral supergroup contains many related species of interest to collectors.
Bytownite is found in basic plutonic rocks, some metamorphic rocks, and meteorites. Although sulfur is very abundant, facetable material is not. An overview on Labradorite Jewelry and Gemstones. Jeremejevite would make a durable and attractive jewelry stone, but this rare mineral occurs even more rarely as facetable material.

It has not yet been seen as a gem, but the high hardness would allow it be worn with no risk of scratching.

Blue and greenish gems are lovely, although very difficult to cut. It has been argued that tektites originated as a result of violent explosive activity on the Moon and were thrown all the way to the Earth’s surface. These rare gems are renowned for showing intense blue colors. Kämmererite is a beautiful but rare mineral. Agate. Sometimes a stone is faceted in the nature of jet or marcasite. Faceted rhodonite has an intense, beautiful color, but this material has a reputation as one of the most difficult gemstones to cut. Faceted diopside is not extremely rare, but large (over 15 carats) clean stones are. Gahnospinel is a solid-state solution between spinel and gahnite. I do not know of the existence of a faceted gem at this writing. Actinolite is a member of a series that contains varying amounts of iron and magnesium. The amphibole group is very large and extremely complex and contains numerous distinct species that vary subtly in chemistry and physical properties. Chrysoprase is apple-green chalcedony that derives its color from nickel. An emerald-green variety of grossular garnet, tsavorite is one of the most popular and expensive varieties of garnet.

Wavellite is a very attractive mineral, well-known to collectors. Zincite is a very rare mineral, essentially restricted to one important locality.

It’s solely a curiosity in the gem world.

It typically forms aggregates of packed fibers that are mixed with other minerals, resulting in a green and white pattern reminiscent of tortoise shell. Sunstones contain hematite or goethite inclusions, which reflect light in parallel orientation and create a sparkling sheen in gold to brown color shades. Bustamite may also be fibrous, and then yields fine catseye gems, but these are extremely rare.

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