Evaluation and purchase of opal:
The evaluation of opal is based on factors such as color, position of the eyeliner, shape of the gemstone, weight, and the like. High-quality cat's eye gem, the cat's eyeliner should be thin and narrow, and the boundary is clear; the eye should be closed and flexible, and the light should be bright; the cat's eye color should be in sharp contrast with the background; and the cat's eye line should be in the center of the curved surface. When purchasing, the opal should be distinguished from other gemstone cat eyes and artificial cat eyes according to the identification features, and the real opal can be purchased.
In Southeast Asia, opal is often considered a symbol of good luck, and it is believed that it will protect the owner's health and longevity from poverty. Opal is often referred to as "noble gems." Together with the stone, it belongs to one of the world's five precious high-end gemstones. British gem collector Hope has a famous opal stone that has been carved into a shape that symbolizes the altar. There is a torch on the top. The whole gem is spherical and about 1-1.5 inches in diameter. Opal is mainly produced in gas-forming hydrothermal deposits and pegmatite veins. The world's most famous opal origin is in the southwestern part of Sri Lanka, such as Tranabula and Gower, and countries such as Brazil and Russia have also found opals, but they are very rare.
People first discovered gold emeralds in sand mines. At present, most of the cat's eye mining is in riverbeds. The formation of primary gold emeralds is related to the interaction of the volatile components of the invading granite melt with the ultrabasic rocks rich in chromium. For this reason, the original gold emeralds are prolific in intertwined emerald-clouds in ultrabasic rocks, which geologists call gas-forming hydrothermal deposits, like many emeralds, all gold emeralds and emeralds. Often grow together. After the formation of the original gold emerald, it will become a sand mine after being weathered and denuded, and it will be integrated into the mine at a certain favorable position.
The famous Sri Lankan cat's eye and metamorphic stone are produced in the sand mine. The original gold emerald is also produced in the pegmatite vein, which is the result of the action of molten volatile components. The formation of pegmatite veins is due to the crystallization of some fusible minerals. The veins are formed along the cracks and faults of the surrounding rock, in which the gold emerald forms isolated crystals, and the minerals that coexist with the gold emerald in the pegmatite veins are beryl (including emerald), tourmaline and apatite. . The surrounding rocks of the pegmatite veins are mostly ancient metamorphic rocks (gneiss), which may be the source rocks of gold emeralds.
Sri Lanka is a famous gold emerald producing area and the only country producing metamorphic and golden-green cat eyes. The country's gold emerald deposit is located 60 kilometers southeast of Kandy City and has a mining history of more than 2,000 years. It is a large comprehensive sand mine. The gem-bearing plateau group is composed of granulite facies metamorphic rocks with a mineralized area of ​​about 2,000 square kilometers. Gemstones that coexist with gold emeralds include sapphires, rubies, zircons, and spinels. These gemstones are produced in river valley alluvial deposits, which are generally 1.5-15 m thick and sometimes 30 m thick. The cat's eye quality produced in Sri Lanka is the best, with a honey-yellow color and a light strip with three lines as a premium treasure. The cat's eye in the country is cherished by the world and is very famous. The Sri Lankan cat's eye has a special English name: Cymophane. This cat's eye has a strange phenomenon when the cat's eye is placed under two spotlights. As the gem turns, the cat's eye will open and close.
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