Emerald is a very precious gem, also known as the king of emerald. It is one of the four precious gemstones recognized by the international jewelry industry. Do you know the characteristics of emerald? Let's have a look
What is emerald
Emerald refers to emerald green beryl containing chromium. Its chemical composition is aluminum beryllium silicate. Its crystal is hexagonal columnar. It belongs to hexagonal crystal system. It is emerald green or dense green, with a specific gravity of 2.6-2.8 and a hardness of 7.5-8. It is brittle and easy to break; Transparent, glass luster. Beautiful color, transparency and high hardness are valuable characteristics of emerald. Its main producing areas are Colombia and the former Soviet Union. Emerald is often used as jewelry such as ring face, earrings and corsage.
The green of emerald comes from the chromium ion in it, which can be observed by Charles filter. Under the Charles color filter, most emeralds will appear dark red due to the existence of chromium ions, and most other green substitutes will appear dark green. This rule can only be used as a reference for identification and cannot be used to determine the authenticity, because some African emeralds do not show red under the color filter, on the contrary, some artificial emeralds show strong red.
Emerald belongs to beryl family, which is hexagonal crystal system. Crystals are often hexagonal columnar, rarely vertebral surface. There are corrosion pits on the cylindrical surface and bottom shaft surface.
Because it is formed in the rock stratum that is often compressed by stress, almost all emerald crystals are broken, and there are many inclusions, and the ones with complete crystals are very rare. Emerald's green color is different from that of other natural emeralds. With the characteristics of a large number of inclusions, more experienced people can distinguish it.
Color characteristics of emerald
The color of emerald is very attractive. Some people use spinach green, onion heart green and tender tree bud green to describe it, but they can't accurately express its color. It is a little yellow in green and seems to be a little blue. Even the spectrum seems to lack a wavelength. It is one of the gemstones that people can never get tired of. Whether cloudy or sunny, whether under artificial light source or natural light source, it always emits soft and colorful light. This is the charm of emerald, the king of green gemstones.
Emerald is a gem grade green beryl. Its green should reach a medium to dense green tone, that is, the color concentration should be relatively saturated. Light green is usually called green beryl.