全部拍賣 / Ethnographic / Rough diamond / Trailer / new- 1.18 g - (1)
Rough diamond pendant / new Set in 925 sterling silver Includes leather cord Weight: 1.18 g / 5.9 ct (weighed without leather cord) 12.0 mm x 6.8 mm x 5.3 mm New and unworn Diamond is the cubic modification of carbon and, as a naturally occurring solid, a mineral in the class of elements. Diamond usually forms octahedral crystals, often with curved and striped faces. Other observed forms are tetrahedron, dodecahedron, and cube. The crystals are transparent, colorless, or colored green, yellow, brown and less commonly orange, blue, pink, red, or gray to black due to impurities (e.g., nitrogen or boron) or crystal lattice defects. Diamond is the hardest natural substance. On the Mohs scale, it has a hardness of 10. Its abrasive hardness according to the RoSiWaL (also called absolute hardness) is 140 times greater than that of corundum. However, the hardness of the diamond is anisotropic, i.e., varies with crystallographic direction. This makes it possible to cut diamond with diamond. In the diamond powder used for this purpose, the crystals are present in every orientation (statistical isotropy), so the hardest among them always act on the to-be-ground body. Diamond is optically isotropic with a high refractive index and high dispersion. It exhibits fluorescence and phosphorescence and is triboelectric. It possesses the highest thermal conductivity of all known minerals. Shipping as insured registered mail.
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