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Asterism on the surface of a blue star sapphire. A purple-pink star sapphire displaying asterism in a platinum ring.. An asterism (from Ancient Greek ἀστήρ (astḗr) 'star' and -ism) is a star-shaped concentration of light reflected or refracted from a gemstone.
A 0.37-carat (0.074 g) brilliant cut purple Yogo sapphire. Only about two percent of Yogo sapphires are purple. The Yogo dike is a narrow subvertical sheet-like igneous body. It varies from 2 to 26 feet (0.61 to 7.92 m) thick and extends for 5 miles (8.0 km), striking at an azimuth of 255°.
However, the Greek and Latin terms smaragdos, smaragdus are broad enough to include other green gemstones, the most valuable of which was the emerald. Emerald is a green variety of beryl and is composed of silicate of alumina and glucina.
Gemstones are often treated to enhance the color or clarity of the stone. [40] In some cases, the treatment applied to the gemstone can also increase its durability. Even though natural gemstones can be transformed using the traditional method of cutting and polishing, other treatment options allow the stone's appearance to be enhanced. [41]
The purple dye extracted from the purple dye murex snail and related species was highly prized in ancient times. Clothing made of cloth dyed with Tyrian purple was a mark of great wealth and high station (hence the phrase "royal purple"). The association of gold with purple is natural and occurs frequently in literature. [k]
The most popular form of sapphire is blue sapphire, which is known for its medium to deep blue colour and strong saturation. Fancy sapphires of various colours are also available. In the United States, blue sapphire tends to be the most popular and most affordable of the three major precious gemstones (emerald, ruby, and sapphire).
Heliophorus epicles, commonly known as the purple sapphire, is a species of lycaenid or blue butterfly found in Asia. [1] The species was first described by Jean Baptiste Godart in 1823. Subspecies
The name sapphire is derived from the Latin word sapphirus, itself from the Greek word sappheiros (σάπφειρος), which referred to lapis lazuli. [2] It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors; "parti sapphires" show two or more colors.