Any other variety of beryl is not called emerald. Emerald is the green variety of the mineral called beryl.
The reason possibly comes down to the name, the branding. Gemteck1, CC BY 2.0, via flickr 4 EmeraldĮarlier I said, it does not follow that all colors of the mineral a precious stone belongs to are precious stones as well. Like blue sapphire, the orange variety of sapphire named padparadscha also fetches a high price, as do black and blue star sapphires, or those that exhibit a star-like pattern when reflecting light. Corundum that is even a shade less red than ruby is automatically called sapphire - pink sapphire. While sapphire is most popular, and most valuable, in its deep blue variety, the precious stone occurs in all colors except red, with which the gemstone would be called ruby. Source: Stanislav Doronenko via Wikimedia Commons 3 Sapphire What is it called? A magnificent blue sapphire ring In fact, a pink ruby may not even be called ruby at all. On the other hand, a light red or pinkish piece of the precious stone is deemed inferior in quality.
Accordingly, the most valuable of the precious stone are those whose color is a bright blood-red, also known as pigeon’s blood. The intensity of this red color is the most powerful determinant of ruby’s value. The color of ruby is caused mainly by the intrusion of chromium in the otherwise colorless mineral. An extremely rare gem, the red gemstone is more expensive than white diamond, and is the second most valuable precious stone in the world next to red diamond. Ruby is a red precious stone that comes from the mineral group corundum, which is second only to diamond in hardness (9 out of 10 in the Mohs scale). Source: Humanfeather via Wikimedia Commons 2 Ruby However, it does not follow that all colors of the mineral a precious stone belongs to are precious stones as well, as one of the next in the list would prove. Red diamond is the most expensive gemstone in the world. In fact, except for the yellowish and brown varieties, fancy colored diamonds are even more expensive than white diamonds. While diamonds are commonly thought to be white, the precious stone occurs in practically all colors of the rainbow. Not only is diamond the hardest gemstone on earth (10 out of 10 in the Mohs scale), the refractive index of the precious stone is a dazzling 2.418, which explains how the precious stone is so bright and brilliant - the gemstone keeps light within its translucent crystal about 2 ½ times longer. Their huge supply having been discovered, both tiger’s eye and amethyst plummeted in value and were consequently reduced to semi-precious stones.ĭiamonds are easily the most popular of precious stones, though not necessarily the most valuable. Like tiger’s eye, amethyst was once a precious stone, until a huge deposit of the gemstone was found in Brazil and obliterated the gem’s fame for rarity. The tiger’s eye winning advantage was that the gemstone was extremely rare, at least it used be. Tiger’s eye used to be a precious stone, even though the gemstone is, not translucent, but opaque.
Two of these qualities, however, have not always been permanent. There are 3 qualities that characterize the precious stones of today: (1) beauty, that is, translucency and brilliance, (2) hardness, and (3) rarity. What makes some gemstones precious stones, and others only semi-precious? The catch is, how precious do stones have to be to be actually called precious stones? The word gemstones, or gems, applies to precious and semi-precious stones alike. Precious stones are just that - precious. Source: Washington Diamonds/Inbal-Tania Studio via Wikimedia Commons What are precious stones? Diamonds, the most popular precious stone
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