Wide range of yellow and orange sapphires is available in Bangkok and Moscow. Worldwide delivery. Unique gems are available for order in accordance with particular parameters and within the budget of the customer.
Yellow sapphire is second line popularity rating immediately after blue sapphires. Like other varieties of sapphires of yellow and orange are distinguished by high hardness, excellent luster, and loads of interesting shades. Visually, these solar corundum resemble expensive diamonds yellow. Cutters often use the same methods of cutting, which contribute additional similarity. Properly faceted corundums yellow color play in the light sparkling flashes. Because of this, they are known as Golden or solar sapphires. The cost of untreated yellow sapphires depends on the size of the gem, the purity and the degree of saturation of yellow color. Gems with a good cut medium size - 3-5 carats, visually clean range in price between $700-1500 per carat.
There are many shades of crystal, ranging from pale and bright ending. The most rare samples include non-heated crystals of Golden-yellow tone of natural origin. They often have a trading name of Golden color (golden). Sapphires the category of "golden" rarely do the jewelry market of Sri Lanka and Madagascar. The cost of these gems amounts to $1500-3000 per carat depending on the purity and size. Golden sapphires more than 15 carat may cost more.
As a rare green sapphires, which are found only in collectable jewelry. These rocks have generally low color saturation and actually look gray. Also come across instances with alternating green, yellow, and blue zones mined in Thailand, Australia and Madagascar. Such area sapphires are often used in jewelry of luxury, but of great interest to collectors.
In addition to yellow sapphires, often found orange corundums. This unusual and rare sapphire color is very rare in nature and is achieved by the following methods of refining:
Beryllium diffusion (beryllium treatment) - impregnation of slightly colored crystals of corundum with beryllium under high temperature and pressure. Beryllium has a smaller atomic mass and is able to penetrate into the crystal lattice of sapphire, painting it a brighter color. It is important to note that the beryllium penetrates deep enough, and gems with a diameter of 2-3 mm can be saturated with beryllium to the full depth. Larger gems are painted only on the periphery, and the internal volume of the gems is not affected, so the processing of sapphire by the method of beryllium diffusion is only possible on an already cut gem. Samples after beryllium diffusion become bright and are sometimes not the natural orange and yellow hues, they are cheap - $20-40 per carat. In the expert opinions of the world's laboratories for such gems is a fact of refining beryllium. Such sapphires are used in the manufacture of cheap jewelry level of mass market, where the fact of ennoblement of gem is often hidden.
Heat treatment (heat treatment) - treatment of sapphire materials with insufficient color saturation high-temperature heating. The result of the heat treatment raw material color changed to brighter and more saturated through the entire depth of the crystal. After cutting such materials, you can see the beautiful orange color. Such samples more than 3-5 carats are very rare, and if they have vivid colors and good clarity, then the cost comparable to the cost of untreated yellow sapphires - $700-1500 per carat. Because of the huge difference in cost between treated and only diffundiruet beryllium sapphires, dealers must place emphasis on the fact that their orange sapphire heated only, and beryllium diffusion was not used.
The value of the yellow and orange sapphires
Above we have cited the cost of a yellow sapphire will now summarize:
Untreated yellow sapphires average weight 3-5 CT - $700-1500 per carat depending on the purity and color saturation. Yellow sapphires after heat treatment are 1.5-2 times cheaper.
The top samples of yellow natural sapphires category Golden "golden" - $1500-3000 per carat.
Orange sapphires after heat treatment - $700-1500 per carat depending on size, color, cut and clarity.
Orange sapphire after beryllium diffusion - $20-40 per carat, they are not used in expensive jewelry.
The cost for sapphires yellow color scheme is growing every year, these prices averaged and actual for the 2017-2018 year.