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YELLOW SAPPHIRE

 This is a natural Yellow Sapphire mined in Sri lanka.

It has a magnificent yellow hue and dances under lighting.

Heat treated and Beryllium treated. Both are permanent treatments

Cut Oval

Weight 2.89 cts

Size 8.56 x 7.24 x 5.16 mm

Grading VS

This stone is sent in a sealed envelope with a plastic window-if opened it cannot be returned.

Sapphire is one of the two gem varieties of corundum, the other being the red ruby. Although blue is the most well known hue, sapphire is any color of corundum except red. Sapphire may also be colorless, and it also occurs in the non-spectral shades gray and black. Pinkish-orange sapphire is known as padparadscha.

The cost of natural sapphire varies depending on their color, clarity, size, cut, and overall quality as well as geographic origin.

TREATMENTS

Sapphires may be treated by several methods to enhance and improve their clarity and color.  It is common practice to heat natural sapphires to improve or enhance color. This is done by heating the sapphires to temperatures between 500 and 1800 °C for several hours, or by heating in a nitrogen-deficient atmosphere oven for seven days or more. Low Tube heating is where the stone is placed in a ceramic pot over charcoal, in which a man blows air through a bamboo tube to the charcoal creating more heat. The stone becomes a more blue in color but loses some of the silk. When high heat temperatures are used, the stone loses all of the silk and becomes clear under magnification. Evidence of sapphire and other gemstones being subjected to heating goes back to, at least, Roman times. Diffusion treatments are somewhat more controversial as they are used to add elements to the sapphire for the purpose of improving colors. Typically beryllium (Be) is diffused into a sapphire with very high heat, just below the melting point of the sapphire. Initially (c. 2000) orange sapphires were created with this process, although now the process has been advanced and many colors of sapphire are often treated with beryllium. It is unethical to sell beryllium-treated sapphires without disclosure, and the price should be much lower than a natural gem or one that has been enhanced by heat alone.