Corundum may be the type of mineral from which sapphires and rubies are derived. The mineral is naturally clear, but can have different colours when impurities are present. Transparent corundums are used as gems, and if they?re red, then they are rubies, while all other colours are known as sapphire. The word corundum comes from the Tamil kurundam Because of corundum’s hardness (usually 9.0) it is frequently utilized as an abrasive in machining, from huge machines to sandpaper. Emery is an impure and less abrasive range, with a Mohs hardness of 8.0. You have most likely utilized corundum hundreds of times when you have filed your nails with an emery board!

Corundum is actually the second hardest substance on the earth, after the diamond, and as such has many industrial uses. Corundum is crushed, ground and screened to different grain sizes. The grains are used within the manufacture of grinding wheels for flour and rice mills, and workshops. Grinding wheels are manufactured either by a mixture of corundum, clay and feldspar or by using sodium silicate like a bonding agent. Finer grains are used for that preparation of grinding-pastes for the automobile industry. Corundum paper and cloth finished to belts, discs, rolls, sheets and other shapes are ready by providing a appropriate coating usually of sodium silicate.

Due to its hardness corundum also finds use in mortars, wire drawing dies, thread guides and gauge blocks. Gem types are sometimes used for pivot supporters in delicate scientific instruments, as jewel bearing in watches.

Corundum in little quantities is utilized within the manufacture of special sparking plugs, mufflers, pyrometer tubes, rods and insulators for vacuum tubes of all kinds. Finely ground corundum, passing through 200 mesh, is used for that manufacture from the above products by providing them a bond of clay.

It?s difficult to envision that a mineral having a name as mundane as corundum yields gems as exquisite as the ruby and sapphire, or even that these two stones, so various in colour and mystique, are really the same mineral loved ones.

Lucky you if your birthstone is sapphire (September) or ruby (July). These are amongst the richest-colored of all gemstones with a romance and background as colorful as they’re. Rubies are really rarer than sapphires, and only red corundums are called rubies. Any other colour is a sapphire. When grading colored stones, the density and hue from the color are component from the evaluation, and it is the richest, deepest colours which are the most prized. In rubies, one of the most prized variant of colour is called pigeon?s blood. Large gem high quality rubies could be much more valuable than comparably sized diamonds and are definitely rarer. There’s a relative abundance of more compact, (1-3 carat,) blue sapphires in comparison towards the scarcity of even little gem high quality rubies, producing even these more compact stones relatively higher in worth.

Stones of Burmese origin usually command the highest prices. The vast vast majority of rubies are “native cut” in the nation of origin. High worth ruby rough is tightly controlled and hardly ever makes its method to custom cutters. Sometimes, this kind of native stones are recut to customized proportions, albeit at a loss of weight and diameter. Customized cut and recut stones are generally more per carat.

Sapphires exist in all of the shades of blue in the deep blue of evening skies to the bright and deep blue of a obvious and stunning summer sky. Sapphires also are available in many other colors, not only in the transparent grayish misty blue of far horizons, but additionally displaying the vibrant fireworks of sunset colours ? yellow, pink, orange and purple. So sapphires are really and really heavenly stones, although they’re being found within the hard soil of our so-called “blue planet?.

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