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A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide).Other varieties of gem-quality corundum are called sapphires.Ruby is one of the traditional cardinal gems, together with amethyst, sapphire, emerald, and diamond. [1]
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Ruby is a pinkish-red-to-blood-red-colored gemstone, a variety of the mineral corundum (aluminium oxide). Ruby is one of the most popular traditional jewelry gems and is very durable. Other varieties of gem-quality corundum are called sapphires. Ruby is one of the traditional cardinal gems, alongside amethyst, sapphire, emerald, and diamond. [3]
Individually, ruby-bearing zones can measure up to 20 metres in thickness and up to 200 metres in length. They may occur as single showings, but are usually found in alignments of multiple showings, with some of the occurrences such as The Ruby Island Line collectively up to 3.5 kilometres in strike length, and as much as 100 metres in width. [5]
Corundum is a crystalline form of aluminium oxide (Al 2 O 3) typically containing traces of iron, titanium, vanadium, and chromium. [3] [4] It is a rock-forming mineral.It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. [7]
The Ruby–Poorman mining district in the U.S. state of Alaska produced nearly a half million ounces of gold, all from placer mines. Some of the largest gold nuggets found in Alaska are from the district, which lies along the Yukon River. [1] The placers are mostly deeply buried, and most were originally worked with shafts and drifts.
The Sunrise Ruby. The Sunrise Ruby [1] [2] [3] has been the world's most expensive ruby, most expensive coloured gemstone, and most expensive gemstone other than a diamond [2] [3] [4] until the discovery of the Estrela de Fura. Originally mined in Myanmar, its current name is derived from a poem of the same name, written by the 13th-century ...
[5]: 431–707 Sapphire and rubies are often found in the same geographical settings, but they generally have different geological formations. For example, both ruby and sapphire are found in Myanmar's Mogok Stone Tract, but the rubies form in marble, while the sapphire forms in granitic pegmatites or corundum syenites. [5]: 403–429