Sapphire

Sapphire sapph1

Velvety blue. Liquid blue. Evening-sky blue. Cornflower blue. Sapphire, beloved for centuries as the ultimate blue gemstone. The ancient Persian rulers believed that the earth rested on a giant sapphire and its reflection colored the heavens blue. Indeed, the very name in Latin, “Sapphiru,” means blue.

 

But like the endless colors that appear in the sky, sapphire is also found in many, many other shades besides blue, from the gold of a sunrise, to the fiery reddish-orange of sunset, to the delicate violet of twilight. Sapphire may even resemble the pale white gloaming of an overcast day. These diverse colors are referred to as “fancy” color sapphires.

 

A gift of a sapphire symbolizes a pledge of trust and loyalty. It is from this tradition that sapphire has long been a popular choice for engagement rings.One of Nature’s most durable gemstones, sapphire shares this quality with its sister, the ruby.

 

Sapphire is found in many parts of the world, but the most prized sapphires are from Myanmar (Burma), Kashmir and Sri Lanka. The purer the blue of the sapphire, the greater the price the gemstone can command, however, many people find that the darker hues of sapphire can be just as appealing.

 

Over the centuries, methods have been developed to enhance the purest hues of sapphire. This is now commonly achieved by controlled heating, a technique that not only improves color but also improves clarity. But heating will only improve the color if the gemstone already contains the chemistry required. Heating sapphires is a permanent enhancement, as lasting as the gemstones themselves.

 

A new method of artificially changing the natural color of a sapphire is diffusion, whereby beryllium or a similar element is diffused into the surface of the gemstone, producing a richer color. Sapphire treated by diffusion is far less costly and much more available than rare fine untreated gems or those successfully heat-treated.

 

Specifications


Origin: Sri Lanka, Burma and various other localities

Color: Very Light to Very Dark Violetish Blue to Greenish Blue

Species: Corundum

Refractive Index: 1.762 to 1.770

Birefringence: 0.008 to 0.010

Specific Gravity: 4.00

Hardness: 9 on Mohs Scale

Birthstone Month: September

Anniversary Year: 5th and 45th

Courtesy of OMI Gems, Inc.