We tested all our yellow sapphires for signs of irradiation treatment with various methods, such as exposing gemstones to UV light.īesides irradiation, yellow sapphires often experience intense heat and diffusion treatment. For this reason, most consumers avoid it. Laboratory-induced sapphires are not harmful to humans or radioactive but the color has been known to fade due to heat and light exposure. Yellow sapphire can also be colored naturally by low levels of radiation inside the earth or by radiation induced by the lab. The titanium trace element causes unwanted green lighters in yellow sapphires, and the most valuable stones are relatively free of titanium. In general, an increase in iron concentration will increase color saturation. The most common cause is trace element iron. There are two very different causes of yellow in sapphires. The popularity of yellow sapphire has grown in recent years due to its resemblance to yellow diamonds, which are also sought after due to publicity by their famous celebrity owners. The preferred yellow sapphire is yellow walnut. Yellow sapphires can range in color from greenish yellow to orangutan yellow and everything in between. Other characteristics include strong fluorescence, color zoning, and the presence of silk. However, the color is lighter in color and contains secondary pink or purple colors. Etruscans, Greeks and Romans craved rubies and Indians called Sri Lanka "Ratnadeepa," which means "Gems Island." Sri Lankan rubies tend to be brighter than rubies from other locations, and also tend to have higher clarity. Lanka has a long history with gemstones and is a great source of sapphires, rubies and other gemstones. Prices for Burmese rubies are premium because the number of stones sold is limited to items imported before acting. In 2008 Congress issued a law banning the import of Burma and ruby jade into the United States. The Hsu Hsu region was just developed in the 1990s. While the exact date is hard to come by, it is believed that the Mogôk Valley has been a source of rubies for almost a thousand years. Straw from Myanmar is mainly found in two locations: the famous Mogôk Valley, and Möng Hsu. Classic Burmese rubies have intense color combinations, silks and strong strong fluorescence. Myanmar, formerly known as Burma, has been the main source of the highest quality rubies for centuries. ![]() The most well-known Ruby Stone sources are Myanmar (Burma) and Sri Lanka (Sri Lanka). Rubies and sapphires are only found in several locations throughout the world. Pink corundum will fall under the category of pink sapphire and red corundum, with medium to very dark red tones, categorized as ruby. In European and North American markets, red and pink corundums are often delegated into two separate color categories. While rubies are universally accepted as red corundums, the categorization of red gemstones, and thus Rubies, can include shades of pink in some Asian markets. Rubies have their red color from high levels of trace chromium. A typical characteristic of Ruby is its red color. Various types of corundum can be categorized by color, optical phenomena (asterism, for example), internal features, and transparency. Like Sapphire, rubies are also members of the corundum mineral species. Skill cutters will direct their stones when cutting the most desired blue until the purple-blue color shows through the finished gem.īlue sapphires are found in a number of locations throughout the world including Kashmir, Myanmar, Sri Lanka, Madagascar, Thailand, Australia, Tanzania, and the state of Montana in the United States. Seen in one direction, most blue-blue sapphires to violet-blue blue, from the other direction, are turquoise. Sapphire is a dichroic stone, which means the color varies depending on the angle from which the stone is seen. ![]() In blue sapphire, the pieces can affect color in a surprising way. This means matching pairs are difficult to find in larger sizes. ![]() Instead, each stone is formed to maximize the results of coarse crystals. blue sapphire weighing one carat or more usually does not cut into calibrated sizes or standard shapes. Although the supply of commercial-quality blue sapphires is now reliable, the rough quality of blue is always rare and expensive. ![]() In fact, silk inclusion can increase the value of stone by giving the impression of velvet like precious Kashmir sapphires.
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