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.

Heat treated star sapphire.

Our sapphires are not synthetic heated to extreme temperatures diffused irradiated glass filled or oiled. Whereas heat treated sapphires have made it possible to reach every brick and mortar and online retailer around the world. The most common treatment for star sapphire is heat treatment. Learn how heat treatments beryllium diffusion flux healing fracture filling and irradiation change the look of sapphires on the market today and into 2020.

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. Heating often improves the color and clarity of the gem. The foundational composition for all these gemstones is the same. A reputable dealer will always disclose whether a stone has been.

Heat treated sapphires may show no lines or just at 4500. 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. High temperature 1 60ooc rapid cooling 3. Some flux grown synthetic sapphires have a faint line at 4500 most not diagnostic.

Generally before they are cut stones are heated to between 1700 to 1800 degrees celsius 3100 3300 degrees f for several hours. Heat treatment processes used on sapphires and rubies treatment group specific processa result heating only 1. Extended heating 1 800â c heating under unknown 6. Our natural untreated sapphires offer true beauty rarity and superior value compared to treated sapphires.

Moderate temperature 1 30ooc 2. Synthetic color change sapphires show a line 4740. In the market almost 95 of the sapphires are heat treated. We offer a vast selection of blue sapphires pink sapphires yellow sapphires white sapphires and other unique natural sapphires.

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. Synthetic green sapphires show lines at 5300 and 6870. As a general rule when shopping for sapphires you should always.

Reductive heating 1 6oo0c 4. Sapphires that are heat treated are still considered natural 100 natural. Sellers heat or cook sapphires in their rough state before handing them to a gemcutter for faceting. Heat treatment in sapphires is legal and acceptable.

Natural green sapphires show lines at 4500 4600 and 4700. Lines rarely seen in kashmir sapphires. 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.