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Therefore, the physical and optical properties of synthesized CZ vary, all values being ranges. It is a dense substance, with a density between 5.6 and 6.0 g/cm 3 —about 1.65 times that of diamond. Cubic zirconia is relatively hard, 8–8.5 on the Mohs scale—slightly harder than most semi-precious natural gems. [1]
The carat (ct) is a unit of mass equal to 200 mg (0.00705 oz; 0.00643 ozt), which is used for measuring gemstones and pearls. The current definition, sometimes known as the metric carat , was adopted in 1907 at the Fourth General Conference on Weights and Measures , [ 1 ] [ 2 ] and soon afterwards in many countries around the world.
— "Values ranging from 21.3 to 21.5 gm/cm 3 at 20 °C have been reported for the density of annealed platinum; the best value being about 21.45 gm/cm 3 at 20 °C." 21.46 g/cm 3 — Rose, T. Kirke. The Precious Metals, Comprising Gold, Silver and Platinum .
Stone weight with Darius the Great–era tri-lingual inscription. 9,950g The Eschborn Museum's 2nd-century stone weight of 40 Roman pounds (c. 13 kg), beside an ID-1-sized card for scale The name "stone" derives from the historical use of stones for weights, a practice that dates back into antiquity.
Items of body piercing jewelry have an important common factor: the diameter of the part of the item of jewelry where it will rest in the piercing site. With the wearing of European-traditional kinds of earrings, that thickness is not an issue, because jewelry is made to use only thin wire for support, and the wearer need only have a narrow piercing hole to accommodate it.
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 ...
Gemstones of the World revised 5th edition, 2013 by Walter Schumann ISBN 978-1454909538 Smithsonian Handbook: Gemstones by Cally Hall, 2nd ed. 2002 ISBN 978-0789489852 hide
The contribution of the muscle to the specific heat of the body is approximately 47%, and the contribution of the fat and skin is approximately 24%. The specific heat of tissues range from ~0.7 kJ · kg−1 · °C−1 for tooth (enamel) to 4.2 kJ · kg−1 · °C−1 for eye (sclera). [13]