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https://www.firemountaingems.com/resources/encyclobeadia/gem-notes/hb0d
Jet is a velvety black-colored gemstone that is a type of lignite. This jet black gem was used in Britain as far back as the Neolithic period when it was made into beads for personal adornment. The Romans used jet for rings, hair embellishment, pendants and other forms of jewelry.Chemical Composition: Variable, but rich in carbon
https://www.gemsociety.org/article/jet-jewelry-gemstone-information/
Feb 02, 2021 · Jet is a variety of lignite coal. It forms from fossilized wood. Since it has an organic origin, it’s not a mineral. Nevertheless, it’s considered a gem, like amber and pearl. Although jet resembles anthracite coal, it’s less brittle. Jet takes a very good polish. Faceting can add some sparkle to the somber tones of jet jewelry. (Gemstones often have a flat bottom).Colors: Black, brownish.
https://geology.com/gemstones/jet/
Jet can be rubbed to a nice matte finish or polished to a very bright luster. Done well, these finishes enhance the aesthetic value of carved or cut pieces of jet. Jet also has a low specific gravity. A strand of jet beads or a large cabochon thus weighs about 50% less than if they were made from agate, jasper, quartz, or other mineral material. This allows the beads to be worn with greater comfort and the …Classification: Sedimentary rock similar to coal
http://www.arthistory.net/victorian-jet-jewelry/
Jet may also feature pyrite inclusions in its composition which produces a brass or metallic sheen. Essentially, jet is wood that has decomposed under pressure over a period of millions of years. Jet is found in both hard and soft varieties. Good quality jet was used to create jewelry for thousands of years.Estimated Reading Time: 3 mins
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