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" ... Although the process of assessing colored stones requires an aesthetically-driven kind of expertise, it doesn’t mean all gemstones are equal. Rubies, sapphires, and emeralds sourced from historically significant regions are still more desirable and continue to fetch higher prices. For centuries esteemed mines in Kashmir, Sri Lanka, and Burma have produced highly sought after corundum, the extremely durable mineral that forms rubies and sapphires. These mines are known for producing stones with deep color saturation, like prized “pigeon blood” rubies and “velvet” blue sapphires. Even though they are found on every continent, a vanishingly small percentage of colored stones on the market stand apart. Over 98% of the stones available today have been heated in an attempt to improve their natural color. Connoisseurs should look for telltale signs that the mined material remains authentic and untouched by human meddling. At first glance a high quality stone should have three things: a deep color tone, few visible inclusions, and a symmetrical faceted cut. ... "
" ... Carmeltazite and its hosting corundum most likely formed near the crust-mantle boundary of Earth, at a depth of almost 18 miles. Under high pressure and temperatures, the partially molten rocks released fluids, which reacted to form new minerals. The corundum crystals, containing the carmeltazite, were then transported through volcanic vents into the upper crust. Sixty-five million years ago volcanoes flooded the area with lava and steam-blast eruption produced thick deposits of volcanic breccia and tuff. Carmeltazite is found as veins almost black to dark green in color with a metallic luster in the larger blue sapphire-like crystals, embedded in the volcanic rocks. The largest stone discovered so far has 33.3 carats (0.25 oz). ... "
" ... If you're lucky and were born in July, ruby is your birthstone of the month. Ruby is a variety of corundum which is then colored to a deep red coloring by chromium. One of the other variations of corundum is sapphire dependent on the impurities within the mineral. The name of ruby comes from the Latin word for red, rubeus. ... "