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The museum has ongoing exhibits of regional minerals and gemstones of interest to the general public and a workshop where gem-cutting and polishing demonstrations are held." [ 2 ] The guidebook further elaborates that "This museum is run by the Henderson County Gem and Mineral Society [HCGMS], a valuable source of information for those people ...
In Australia, there are numerous gem shows, including an annual gem show called the GEMBOREE, which is a nationwide lapidary competition. There is a collection of gem and mineral shows held in Tucson, Arizona, at the beginning of February each year. The event began with the Tucson Gem and Mineral Society Show and has now grown to include dozens ...
The first major development in diamond cutting came with the "Point Cut" during the later half of the 14th century: the Point Cut follows the natural shape of an octahedral rough diamond crystal, [2] eliminating some waste in the cutting process. Diamond cutting, as well as overall processing, is concentrated in a few cities around the world.
The largest gem cut from it was a 128.25 carats (25.650 g; 0.9048 oz) pear-shaped diamond. The same year it was purchased by Stavros Niarchos, Greek shipbuilder and industrialist, whose name it currently bears. Also cut from the rough were a 27.62 carats (5.524 g; 0.1949 oz) marquise and a 40 carats (8.0 g; 0.28 oz) emerald cut.
Then a burr of the proper size is used to cut what is known as a "bearing", which is a notch that corresponds to the angles of the stone. The burr most often used is called a "hart bur", and is angled and sized for the job of setting diamonds. The bearing is cut equally into all of the prongs and at the same height above the base.
Gem-cut synthetic silicon carbide set in a ring. A diamond simulant is a non-diamond material that is used to simulate the appearance of a diamond, and may be referred to as diamante. Cubic zirconia is the most common. The gemstone moissanite (silicon carbide) can be treated as a diamond simulant, though more costly to produce than cubic ...
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