6/19/2023 0 Comments Ruby sapphire stone"Pigeon's blood red" ruby crystal from the "Valley of Rubies" in Mogok, Myanmar, 3.9 x 2.7 x 2.5 cm, 23 g. This is the source of the world's finest rubies. ![]() ![]() Corundum originates in metamorphic marbles that have largely weathered away. Miners recover them by washing and screening with broad screens, then handpicking promising pebbles. Gems occur in a gravel layer called byon at a depth of 20 to 100 feet. ![]() The history of the mines here is long, complex, and turbulent. Ruby historically comes from the Mogok stone tract. Pastel yellow sapphire, round brilliant cut, 1.90 cts, 7.2 mm, Sri Lanka. You can learn more about the formation and chemistry of rubies and sapphires here. Miners often find gem corundums in placer deposits. It also occurs in igneous rocks, such as granite and nepheline syenite. The mineral corundum forms in metamorphosed crystalline limestones and dolomites, as well as other metamorphic rock types such as gneiss and schist. Gem-quality red corundum is considered ruby, while all other colors of gem-quality corundum, including colorless, are sapphire. ![]() Ruby and Sapphire Origins and Geologyīoth ruby and sapphire are corundum, just with different colors. Matched pair of blue sapphires, 1.23 ctw, from Rock Creek, Montana. Since ruby and sapphire origins play a major role in determining the value of these gems, gemologists, jewelers, and consumers alike should learn where these prized stones come from.ĭetermining ruby and sapphire origins can be difficult, but the inclusions in these gems can help identify where they were mined. Although non-gem corundum occurs abundantly all over the world, gem-quality ruby and sapphire are significantly rarer.
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