Corundum - Wikipedia
Corundum has two primary gem varieties: ruby and sapphire. Rubies are red due to the presence of chromium, and sapphires exhibit a range of colors depending on what transition metal is present. [7] A rare type of sapphire, padparadscha sapphire, is pink-orange.
Corundum Value, Price, and Jewelry Information - International Gem …
The corundum family of gemstones consists of ruby and sapphire. Corundum is very compact, dense, and lacks gemstone cleavage. It’s also the second hardest natural mineral after diamond. Gem-quality corundum is also quite rare. These factors make both varieties of corundum some of the most highly desired jewelry stones.
Corundum Gemstone: Properties, Meanings, Value & More - Gem …
2022年10月3日 · The corundum sapphire is the state gemstone of Montana, USA, and Queensland, Australia. Blue sapphire is Sri Lanka’s national stone, while Myanmar and Thailand honor the corundum ruby as their national stone. This guide covers all the meanings, prices, history, and properties of corundum gemstones. About Corundum Stone.
GIA's Gubelin Gem Project: Corundum
Ruby and sapphire (usually blue, but also in every other color) have been the most important colored gemstones for several thousand years. Originating historically in southeast and central Asia, and more recently in eastern Africa, these colored varieties of the mineral corundum have been much sought as gems because of their rarity, color and ...
The Mineral corundum - The Mineral and Gemstone Kingdom
The Mineral corundum. Corundum is best known for its gem varieties, Ruby and Sapphire. Ruby and Sapphire are scientifically the same mineral, but just differ in color. Ruby is the red variety, and Sapphire is the variety that encompasses all other colors, although the most popular and valued color of Sapphire is blue.
Corundum: Use as a Gemstone, Abrasive, Refractory - Geology.com
Corundum is a rock-forming mineral that is found in igneous, metamorphic, and sedimentary rocks. It is an aluminum oxide with a chemical composition of Al 2 O 3 and a member of the trigonal crystal system.
Geology of Corundum and Emerald Gem Deposits: A Review
2020年1月31日 · Gem corundum occurs worldwide as xenocrysts or megacrysts in xenoliths or enclaves incorporated in basaltic magmas during their ascent. Such sapphire and ruby deposits occur from Tasmania through eastern Australia, Southeast Asia, and eastern China to far eastern Russia (Graham et al., 2008).
Corundum Gem Guide and Properties Chart - Gemstones.com
This Corundum gemstone guide lists qualities of the Corundum gem type, including stone colors, common names, meanings, gemstone hardness and more.
GIA Gem Project Corundum
Gem corundum can display asterism and chatoyancy due to the presence of oriented mineral inclusions, and in some cases, a change of color when viewed under different light sources. Ruby and sapphire (usually blue, but also in every other color) have been the most important colored gemstones for several thousand years.
Corundum: Properties, Uses and Virtues - Gem Gazette
2024年6月12日 · Corundum, a royal family of precious stones admired for its rubies and sapphires, offers an unexpected diversity of hues. Discover its geological formation, its historical role and its metaphysical properties. Appreciated for its beauty and utility, corundum dazzles with its variety and durability, magnifying kingdoms and spirits.