Garnet authentication method

Garnet there are many varieties, including emerald green, grain transparent is a rare species. Mozambique garnet production, the price is also very high, most of the domestic garnet color black, and the price is lower. Most important evaluation garnet color, the color should be bright and pure, followed by higher transparency, so processed precious stones bright "fire"; Again, fewer defects, style to the United States; the size of the general varieties value is smaller. Note starlight and cat's eye gemstone, if the color is garnet, 5 lines, or liner, is a higher value varieties. Universal MF R3M2 (SiO4) 3, R represents a divalent elements (calcium, magnesium, iron, manganese), M is a trivalent element (Al, Fe, Cr), R and M, the type of composition will form a different garnet subspecies, some garnet or even a mixture of different combinations of garnet.
Although different species of garnet, different colors, refractive index, specific gravity and hardness are slightly different, but all are garnet crystal system, single refractive gems, dichroic and polarizing. Common gemstone garnet and features Color: almandine, maroon; pyrope, red; manganese aluminum garnet, orange and yellow; grossular, yellow-green; andradite, green; magnesium iron garnet and Rose red and uvarovite, and emerald green. As a general appreciation or customer, there is no need to determine the garnet species, if we can understand that they are really garnet can. And garnet similar gems on the market is not much, mainly ruby ??red zircon, spinel, synthetic yttrium aluminum garnet, gadolinium gallium garnet and glass imitation products.
Distinguish is: given red stone, red zircon has a dichroic red zircon with a strong double shadow, and garnet goes for, so easy to distinguish with pomegranate; spinel generally lighter in color, detailed identification to use the instrument. The colored natural garnet has some flaws or crystalline inclusions (such as needle-shaped stone, some of the gas-liquid two-phase inclusions, etc.), and Y. A G. , G. G. G. And glass are often very clean, or spherical bread crumb-like bubbles, Chelsea showed a strong red. In fact, for certain garnet, it can also have their own unique characteristics, such as demantoid (green andradite variants) tend to have a "tail-like" fiber inclusions, experienced a glance be seen.