The color of aquamarine is sky blue to sea blue or greenish blue beryl. Its color is mainly due to the trace amount of divalent iron ions (Fe2+), which is best for bright and clean, bright blue to light blue. It belongs to the hexagonal system. The common crystal form is a hexagonal column, followed by a hexagonal double cone, and the aggregates are mostly columnar. Glass luster, transparent to translucent. The refractive index is 1.567-1.590, and the birefringence is 0.005-0.007. The pleochroism is obvious, from blue to blue-green. Hardness 7.5, density 2.68-2.80 g / cm3. Shell-shaped fracture. Does not emit light under X-ray irradiation. Good toughness. The gemstones in China are called “blue crystalâ€. Hardness 8 degrees.
Sapphire is a generic name for corundum gemstones in addition to red rubies in corundum gemstones. The main component is alumina (Al2O3). Blue sapphire is caused by a small amount of titanium (Ti) and iron (Fe) impurities; the color of sapphire can be pink, yellow, green, white, or even in the same stone. Sapphire is produced in Thailand, Sri Lanka, Madagascar, Laos, and Cambodia. The rarest of these is the sapphire in Kashmir, and Myanmar is the place where the finest sapphire is produced today.
The sea sapphire is the birthstone of March, which corresponds to the throat wheel; the sapphire is the birthstone of September. At the same time, the sea sapphire is crystal, while sapphire and ruby, emerald and so on belong to the gem.
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