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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]
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]
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]
Lustre appears in Italian maiolica around 1500, and became a speciality of two relatively minor pottery towns, Gubbio, noted for a rich ruby-red, and Deruta. [2] Around 1550 an even smaller town, Gualdo Tadino , also began to make some, for about a century, [ 3 ] which was the last Renaissance lustre, Gubbio having stopped about 1570, and ...
Among the first few treasures that emerged was the kaustubha, described to be an "excellent gem, the lotus-hued ruby". [3] The Skanda Purana describes the nature of this gem: [4] From the ocean that was being churned emerged a highly refulgent, extremely bright, most excellent gem having the brilliance of the Sun. It was called Kaustubha.
Ruby was the first gemstone to be synthesized by Auguste Verneuil with his development of the flame-fusion process in 1902. [59] Synthetic corundum continues to be made typically by flame-fusion as it is most cost-effective, but can also be produced through flux growth and hydrothermal growth.
Excerpts from a journal belonging to mom influencer Ruby Franke detailing instances of child abuse were released by authorities Friday, one month after the YouTuber was sentenced to four to 30 ...
The color is scarlet-vermilion and the luster adamantine; crystals are transparent and very brilliant, but on exposure to light they soon become dull black and opaque. The streak is scarlet, the hardness 2 to 2.5, [5] and the specific gravity 5.57. Its transparency differs from specimen to specimen, but most are opaque or translucent. [6]