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 - 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.
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 ...
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.
Corundum: Use as a Gemstone, Abrasive, Refractory - Geology.com
Corundum is used as a gemstone, abrasive, refractory and much more. Red corundum is a ruby, blue is a sapphire, any other color is a fancy sapphire. Synthetic corundum is used instead of natural corundum in most applications.
The Mineral corundum - The Mineral and Gemstone Kingdom
Red rubies and blue Sapphires are the most popular Corundum gemstones, though other Sapphire colors such as orange, yellow, and green are becoming increasingly popular in gemstone use. Corundum has some electrical uses, and non gem material, such as Emery, is used as an abrasive because of its high hardness. The gemstone applications of the ...
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.
Ruby Gemstone | Ruby Stone - GIA
Rubies can command the highest per-carat price of any colored stone. This makes ruby one of the most important gems in the colored stone market. In its purest form, the mineral corundum is colorless. Trace elements that become part of the mineral’s …
Corundum: Mineral information, data and localities. - mindat.org
Most commonly refers to a blue gem variety of corundum, but other coloured varieties of corundum are also described as sapphire, except red corundum, which is better known as Ruby. Star Corundum: A variety of corundum exhibiting a star pattern when viewed down the C axis. The chatoyance is due to oriented microscopic inclusions. Star Ruby: A ...