Heat Treated Star Sapphire

Moderate temperature 1 30ooc 2.

Heat treated star sapphire. Heat treatment of sapphire a layman s simplified explanation of the various levels of treatment sapphire is formed deep down below the earth s surface some 65 kilometres down and comes to the surface in a volcanic explosion in a formation tube or vent. High temperature 1 60ooc rapid cooling 3. Sellers heat or cook sapphires in their rough state before handing them to a gemcutter for faceting. The most common treatment for star sapphire is heat treatment.

There is no guaranteed way to predict color changes but according to the gem mountain sapphire mine in philipsburg montana 15 to 20 percent of heat treated sapphires turn yellow or orange. Synthetic color change sapphires show a line 4740. Pick your natural rough stones. Unless stated and certified to be unheated or no heat the sapphires you see on a ring or a pair of earrings are likely to be heat treated.

Our sapphires are not synthetic heated to extreme temperatures diffused irradiated glass filled or oiled. Synthetic green sapphires show lines at 5300 and 6870. Oxidative heating 1 6oo0c 5. There are different levels of heat treatment which affect the price of sapphire however most labs in 2016 only give a heated and unheated certificate.

We offer a vast selection of blue sapphires pink sapphires yellow sapphires white sapphires and other unique natural sapphires. Sapphires that are heat treated are still considered natural 100 natural. Extended heating 1 800â c heating under unknown 6. Heat treatment processes used on sapphires and rubies treatment group specific processa result heating only 1.

A reputable dealer will always disclose whether a stone has been. Heat treated sapphires may show no lines or just at 4500. Other members of the corundum family include ruby padparadscha star sapphire and many other colors of sapphires. Some flux grown synthetic sapphires have a faint line at 4500 most not diagnostic.

As a general rule when shopping for sapphires you should always. Discover what it means for a sapphire to be treated how to identify them how these processes affect the rarity and integrity of a stone. Reductive heating 1 6oo0c 4. Generally before they are cut stones are heated to between 1700 to 1800 degrees celsius 3100 3300 degrees f for several hours.

The higher amount of treatment in the sapphire the lower the price as the corundum s rarity creates its price. Whereas heat treated sapphires have made it possible to reach every brick and mortar and online retailer around the world. Lines rarely seen in kashmir sapphires. Heat treatment in sapphires is legal and acceptable.

Natural green sapphires show lines at 4500 4600 and 4700. Heating often improves the color and clarity of the gem. Learn how heat treatments beryllium diffusion flux healing fracture filling and irradiation change the look of sapphires on the market today and into 2020.