World Largest Sapphire found In SriLanka
Star of Adam named after local belied that Adam arrived in Sri Lanka after being banished from the Garden of Eden
The world’s biggest blue star sapphire, worth at least $100 million (£68 million), has been mined in Sri Lanka.
The gemology institute in the capital Colombo has certified that the gem weighs 1404.49 carats, according to the BBC.
The previous record was 1,395 carats.
“The moment I saw it, I decided to buy,” the current owner, who asked to remain anonymous, told the BBC World Service’s Newsday progamme,adding that it could sell for as much as $175 million at auction.
Sapphire (blue stone which probably referred instead at the time to lapis lazuli) is a typically blue gemstone variety of the mineral corundum, an aluminium oxide (α-Al2O3). Trace amounts of elements such as iron, titanium, chromium, copper, or magnesium can give corundum respectively blue, yellow, purple, orange, or green color. Chromium impurities in corundum yield pink or red tint, the latter being called ruby.
Commonly, sapphires are worn in jewelry. Sapphires may be found naturally, by searching through certain sediments (due to their resistance to being eroded compared to softer stones) or rock formations. They also may be manufactured for industrial or decorative purposes in large crystal boules.Sapphires are used in some non-ornamental applications, including infrared optical components, such as in scientific instruments; high-durability windows; wristwatch crystals and movement bearings; and very thin electronic wafers, which are used as the insulating substrates of very special-purpose solid-state electronics (especially integrated circuits and GaN-based LEDs).
The sapphire is one of the three gem-varieties of corundum, the other two being ruby(defined as corundum in a shade of red) and padparadscha (a pinkish orange variety).Significant sapphire deposits are found in Eastern Australia, Thailand, Sri Lanka, China (Shandong), Madagascar, East Africa, and in North America in a few locations, mostly in Montana.
-Sapphires of other colors:
Yellow and green sapphires are also commonly found. Pink sapphires deepen in color as the quantity of chromium increases. The deeper the pink color the higher their monetary value, as long as the color is tending toward the red of rubies.
Sapphires may be treated by several methods to enhance and improve their clarity and color. It is common practice to heat natural sapphires to improve or enhance color. This is done by heating the sapphires in furnaces to temperatures between 500 and 1,800 °C (932 and 3,272 °F) for several hours, or by heating in a nitrogen-deficient atmosphere oven for seven days or more. Upon heating, the stone becomes more blue in color, but loses some of the rutile inclusions (silk). When high temperatures are used, the stone loses all silk (inclusions) and it becomes clear under magnification. The inclusions in natural stones are easily seen with a jeweler’s loupe.