Even stones that lack transparency make lovely faceted gems. Hexagonite is the rarest of the gem varieties of tremolite. This material is relatively difficult to cut, so faceted pieces are rarely seen. Citrine is the yellow to red-orange variety of crystalline quartz. A threefold cord is not easily broken. Pyrope always occurs in series with other garnet species. Zincite is a very rare mineral, essentially restricted to one important locality. Albite, usually colorless but sometimes yellow, pink, gray or reddish. Although too brittle for most jewelry use, properly cut apatite gems are truly magnificent. The material is obtainable in large size, but softness and cleavage make cutting a real chore. Manganotantalite makes a spectacular red brown gem that is a very rare collector’s item. Large gems are very rare, but smaller stones are available in the marketplace. (John 14:26 – Amplified). However, it’s quite a rare mineral. When Moses held up his hand, Israel prevailed; and when he lowered his hand, Amalek prevailed. Polished slabs and rough material appeared in 1986 at a mineral show in substantial quantities, however. Compact material can make wonderful cabochons, and transparent crystals are rare and usually tiny. Garnet comes from the Latin word, granatus which means grain. The ministry of helps is the grease that keeps the wheel turning. Softer gem materials may also receive cabochon cuts, since cabs don’t show scratches as easily as faceted gems do. Pentlandite resembles other yellowish metallic minerals and is cut by collectors as a curiosity. However, only a handful of cut chabazites may exist because facetable material is extremely scarce. Readily available and moderately priced, the modern March birthstone makes an excellent jewelry stone. Pure blue chrysocolla is extremely soft but interesting to gem collectors. This material is never transparent and is too soft for wear. Our prehistoric ancestors used to string them into necklaces or hang them from cords as pendants. Agates are sometimes opaque, but they are frequently translucent, and occasionally completely transparent. Chiolite makes a challenging gem. However, this rarely occurs in nature. Despite its association with blood and the color red, hematite’s color can range from black and metallic gray to brownish red in thin slivers or crystals. Difficult to facet and typically colorless, beryllonite is a rare collector’s gem. Ludlamite has a lovely green color but is too soft for wear. All rights reserved. Most fine crystal specimens are zealously guarded by mineral collectors and are never faceted. Malachite’s low hardness makes it easy to work, though it still takes a polish very well. Faceted gems are extremely rare and seldom seen even in large collections. The bronzy color rapidly tarnishes in air to a magnificent iridescent color display, mostly purple, but also with blue and green tones. It is much too soft to wear, and the colors are usually nondescript. Precious Stones Jewellers. Covers details and essential information on the physical properties and characteristics of Sellaite gems. Hodgkinsonite is one of the rarest of all collector gems. Faceted gems are slightly brittle and can be chipped, though much less easily than other gems. Translucent material is sometimes cut into cabochons. Tourmaline is a name applied to a family of related minerals with widely varying properties. A rather rare mineral, lovely blue-green grandidierite is seldom seen in gem or jewelry collections. Easy to cut but too soft and fragile for jewelry, a faceted witherite would make an unusual addition to a gem collection. Facetable nepheline is a great rarity, and very few gems have been cut, always in the 1-2 carat range or smaller. Cut bayldonites are a rarity, nonetheless, and are seldom seen in collections. When properly cut it is as bright and attractive as the grossular garnets, which it so strongly resembles. Euxenite is seldom seen in collections. With light blue and green colors, no cleavage, and high hardness, boracite is an uncommon mineral. By itself, glass is brittle and unimpressive with very little color or brilliance. Emerald is acknowledged as one of the most desirable gemstones, and aquamarine has recently sustained an unprecedented rise…. The most expensive gemstones from around the world provide a peek into bizarre mineral assemblages and alterations. Specimens are prized by collectors but can also be faceted with care or cut into cabochons for jewelry. With a dispersion over three times that of diamond and an adamantine luster, faceted specimens make beautiful additions to gem collections. A little-known gem material of truly exquisite color, sky-blue ceruleite takes a very high polish easily and quickly. Explore a range of gemological tests… not only will you get familiar with the process but also time-saving shortcuts. Although they are usually not noticeably recognized, the church could not function without them. Covers details and essential information on the physical properties and characteristics of Prosopite gems. One of the rarest of all facetable gems, cut cuprites can show magnificent deep red color. However, these rare gems are seldom transparent and are usually found as very small crystals. Wavellite is a very attractive mineral, well-known to collectors. As a gemstone, this material is often carved but very rarely faceted. Certainly ample material exists to cut a number of such gems, although they are rarely offered for sale. Satelile is a serpentine pseudomorph after asbestiform tremolite from Maryland and California, grayish to greenish…. Sapphirines are durable but very rare gemstones. Let’s look at each one of these separately. Few gems have held our attention over millennia as well as sapphire. They can generate positive vibes in your body thus strengthening you from inside. Faceted micas are virtually nonexistent because of the perfection of the cleavage and the variable hardness within crystals. Although the mineral itself occurs widely, gem-quality rough is limited. As a result, corundum is one of the best of all jewelry stones, especially star corundum, which is tough as well as scratch-resistant. The IGS had the extraordinary privilege of examining a discovery of facetable material from Brazil that showed previously unknown characteristics. Cut stones are especially beautiful when there are other minerals present to add splashes of green and yellow. The effect is best observed when the fibers are in radial clusters that yield circular markings. Although frequently associated with golden yellow as well as blue, it can be found in a variety of colors, including colorless. Gahnospinel is a solid-state solution between spinel and gahnite. More popular among consumers in Asia than North America, this is a very rare and beautiful opaque gem material with an unusual appearance. Emeralds are a rare variety of the mineral beryl. Holtite is now considered to be a variety of dumortierite. However, unlike other garnets, they’re rarely red or dark. This gem is known for its large sizes. Material containing more or less parallel fibers is somewhat chatoyant and yields weak catseyes. The material is not…. They occur in a wide range of attractive colors and can be extremely bright. Difficult to cut and wear, colemanites are better suited for collectors of unusual gemstones. Interesting cabochons have been cut from wollastonite, especially from the fibrous material (which yields catseye stones) and the reddish material from Lake Superior’s lsle Royale. Reddish granular or massive lepidolite is usually slabbed for ornamental purposes, such as ashtrays paperweights, and bookends. Bowenite is usually blue-green, yellow-green, or dark green and translucent; it is used for carving, knife handles, and so forth, and in jewelry. Agate is a variety of chalcedony that exists in many colors and is often commercially dyed. Tanzanite has had a rapid rise to prominence among jewelers and gem enthusiasts. This material somewhat resembles a pink, granular material from the USSR referred to as canasite. Extremely rare as a cut gem, even in very complete collections. One of the rarest garnet varieties, demantoid can have a green color that rivals emerald and a fire that exceeds diamond.