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It is an amulet, which comprises diamond, pearl, ruby, sapphire, emerald, topaz, cat's eye, coral, and hyacinth (red zircon). Each of these stones is associated with a celestial deity, representing the totality of the Hindu universe when all nine gems are together. The diamond is the most powerful gem among the nine stones.
Diamond (Mohs 10) is 1500 (off scale). Diamond was the hardest known naturally occurring mineral when the scale was designed, and defines the top of the scale, arbitrarily set at 10. The hardness of a material is measured against the scale by finding the hardest material that the given material can scratch, or the softest material that can ...
4.63 mm, 22 mm long, cold-rolled copper, boat-tail spitzer. Neck diameter: 5.02 mm: Shoulder diameter: Shoulderless: Base diameter: 6.48 mm: Rim diameter: 7.44 mm: Case length: 26.10 mm: Overall length: 42 mm overall length: Primer type: Rimfire: Filling: 0.51 grams tubular nitrocellulose powder or 0.57 grams spherical double-base powder ...
The majority of mined diamonds fall between white and pale yellow or brown; what is known as the normal color range. Diamonds of more intense color (usually yellow, but in some cases red, green or blue) are termed fancy color diamonds. Black diamonds are also fancy color diamonds. All other factors being equal, the most valuable diamonds are ...
Jewelers must be careful when molding the metal in a diamond ring. [53] Diamond powder of an appropriate grain size (around 50 microns) burns with a shower of sparks after ignition from a flame. Consequently, pyrotechnic compositions based on synthetic diamond powder can be prepared.
Synthetic sapphire and spinel are durable materials (hardness 9 and 8) that take a good polish; however, due to their much lower RI when compared to diamond (1.762–1.770 for sapphire, 1.727 for spinel), they are "lifeless" when cut. (Synthetic sapphire is also anisotropic, making it even easier to spot.)