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| Guide Expert: China Geological Museum of senior experts Professor Yu Xiaojin What is red, sapphire Commonly referred to as ruby, sapphire is used to signify the red, blue gem, in fact the real Ruby (Ruby) and Sapphire (Sapphire) is to achieve gem corundum (corundum is the mineral name), red, gift pouches The hardness of all minerals in nature after the diamond, and their chemical composition is aluminum oxide (Al2O3), colorless when pure, containing 0.9% -4% of the chromium element was red, blue when the iron and titanium; The shape of rhombohedral crystal form in nature often columnar (ends slightly smaller, thicker middle) or the hexagonal plate appearance more like barrel; color mainly colorless, red and blue, ruby mainly dark purple or orange-red, sapphire blue or blue-green primary, there are other green, yellow, pink, brown and other colors; hardness 9; relative density of 3.99-4.0; as common polyethylene films twins, touch twins, there will be split management; whole is transparent to translucent, glossy sheen of glass appeared to sub-adamantine luster, ruby significantly in the UV lamp red fluorescence, sapphire majority of non-fluorescent; usually red, sapphire refractive index can to 1.762-1.778 for the three groups aligned with fibrous inclusions of gift box, sapphire, with plain curved cutting, to produce star effect. Red, sapphire value measurement Red, sapphire's value and its particle size, weight, closely related to, the following half-carat gem more common, inexpensive; if more than 1 kt on much more expensive, more than 3 carats will increase geometrically. If greater than 10 carats, and the quality of it good, very rare, the value of up to several million dollars. Generally can be divided into several levels to estimate the value of the following: 0.5 less, fine, it is easy to get used to a very low base Xiang; 0.5-1 carat, pellets, easy to obtain, can be used as a small ring plane, cheap; 1-2 carats, medium grain, generally affordable, can be used as pendants ring surface; 2-3 carats, large grain, high-value, market demand; 3-5 carats, large grain, high value, rare; 5 over a large grain, high value, very scarce. Red, sapphire natural products and synthetic chemicals difference Red, sapphire natural products and synthetic jewelry clasp have very different at the appearance, first of all, observe the growth pattern within the gem, Flame Fusion Method for the synthesis of multi-arc, while the natural crystal formation is the straight line. Again, observe the inclusions within the gems, precious stones often contain synthetic flux method failed to melt the melting point and the quality of color caused by small flux residues, in 20 times under the magnifying glass for the "worm-like"; sometimes circular bubble and tiny bubbles, and sometimes can be seen falling down on the crucible hexagonal or triangular platinum film. | ||
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