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The very finest, good quality ruby can be so rare that it has become our planet’s most valued gemstone for thousands of years. In fact, even today, flawless high quality rubies are more valuable and rare than good quality colorless diamonds. A 16 carat ruby sold at auction for US$227,301 per carat at Sotheby’s in 1988. A 27.37 carat Burmese ruby ring sold for US$4 million at Sotheby’s in Geneva in May 1995, or $146,145 per carat. A 32 carat ruby sold for US$144,000 per carat at Sotheby’s in 1989. On the other hand, eight D-color internally flawless diamonds 50 carats were purchased from the past 20 years and also the largest, a pear-shape of 102 carats, fetched merely a US$125,000 per carat. Top rubies are really rare even world’s top gem dealers must incessantly comb through wealthy estate sales and auctions to discover them. Clean bright stones in sizes above five carats are particularly rare.
Ruby will be the gem quality form of the mineral corundum, and something of the extremely durable minerals which exists, a crystalline form of aluminum oxide. Corundum carries a hardness of 9 about the Mohs scale and is particularly quite challenging. In its common form, corundum is even used as an abrasive. Colors of Corundum besides red are called Sapphire. The element Chromium is responsible for the red colorization with this gem, but too much Chromium can actually turn corundum bright green in color. Heat treatment methods are common in ruby gemstones (as they are true for all those types of corundum) and is also used to dissolve "silk" inclusions, which leads to a far more transparent, more intensely colored stone. The heat treatment methods are considered permanent and usually diminish the value of the stone.
The most common supply of fine rubies is Burma, that’s now called Myanmar. The ruby mines of Myanmar are over the age of history: stone age and bronze age mining tools have been discovered inside the mining section of Mogok. Rubies through the legendary mines in Mogok frequently have a pure red colorization, that is identified as "pigeon’s-blood" although that term is a bit more fanciful than an authentic practical standard from the trade today. Myanmar also produces intense pinkish red rubies that are also vivid and beautiful. A lot of the rubies from Burma have a very strong fluorescence when confronted with ultraviolet rays like those in sunlight, which layers on extra color. Burma rubies have a very standing of holding their vivid color under all lighting conditions.
Fine rubies are also present in Thailand. Thai rubies are generally darker red in tone: a real red, tending toward burgundy instead of pink, as Burma rubies do. This may cause them very well liked in the United States where consumers generally prefer their rubies to become a darker red as opposed to a darker pink. Some Thai rubies have black reflections, a phenomenon called extinction, that makes their color look darker laptop or computer in fact is. But Thai rubies also can possess a rich vivid red that rivals the Burmese in intensity. Sri Lankan rubies can even be very beautiful. Many Sri Lankan stones tend to be pinkish in hue and several are pastel in tone. Some, however, resemble the vivid pinkish red hues from Burma.
Rubies from Kenya and Tanzania surprised the world once they put together within the sixties since their color rivals the world’s best. Unfortunately, almost all of the ruby production from all of these countries has several inclusions, tiny flaws which diminish transparency. Rubies from your African mines are hardly ever transparent enough to facet. However, their fantastic color is displayed to full advantage when cut cabochon style. A couple of rare clean stones have been seen which are excellent.
The most crucial aspect in the need for a ruby is color. The most notable qualities are as red understandably: a saturated pure spectral hue with no overtones of brown or blue. An intense pure, beautiful red colors, uniform color is the most valuable gem. Clarity is additionally of secondary importance, but a fine colored gem with slight flaws remains highly valued. Large sizes rubies are more rare than diamond along with a value of fine gem ruby increases significantly (much more than other gems) with an increase of weight.
The phrase red hails from the Latin for ruby, ruber, which can be produced by similar words in Persian, Hebrew, and Sanskrit. The level of color of a good ruby is similar to a glowing coal, essentially the most intensely colored substance our ancestors ever saw. It is no surprise they ascribed magical powers about bat roosting fires that burned perpetually and don’t extinguished themselves.
After color, another factors which influence value of a ruby are clarity, cut, and size. Rubies which are perfectly transparent, without having tiny flaws, tend to be valuable than those with inclusions that happen to be visible on the eye. Cut can make a big difference in how attractive and lively a ruby seems to the attention. A well-cut stone should reflect back light evenly throughout the surface with out a dark or washed-out area in the center that will originate from a stone which is too deep or shallow. The design should be symmetrical where there should not be any nicks or scratches within the polish.
Ruby sometimes displays a three-ray, six-point star. These star rubies are cut in a smooth domed cabochon cut to produce the effect. The star is better visible when illuminated using a single source of light: it moves throughout the stone because light moves. This effect, called asterism, is caused by light reflecting off tiny rutile needles, called "silk," that are oriented along the crystal faces. The value of star rubies and sapphires suffer from certain things: the intensity and attractiveness of our bodies color and the strength and sharpness with the star. All six legs must be straight and equally prominent. Star rubies rarely hold the mix of a fine translucent or transparent color as well as a sharp prominent star. These gems are valuable and dear.
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