Heat Treated Blue Sapphire

Average brilliancy of 40 to 60.

Heat treated blue sapphire. If certified burmese and untreated add 50 except fair or lower grades. Heating is an accepted treatment for sapphire. Distinguishing these levels of treatment can also affect the price of a sapphire dramatically. Heat treating sapphires is a standard industry practice that improves the clarity and enhances the color of sapphires from gem mountain.

There are different types and level of heat treatment in sapphires that can be classified from very slight to quite extreme. In many cases this form of heat treatment may be identified by a dull chalky green fluores cence and the absence of an iron line at 4500 a in blue sapphire and by internal stress fractures figures 2 and 3. Sapphires that are heat treated are still considered natural 100 natural. Most people prefer the darker color saturation and improved clarity and brilliance of a heat treated stone over the pale pastel color of the average rough sapphire.

Learn how heat treatments beryllium diffusion flux healing fracture filling and irradiation change the look of sapphires on the market today and into 2020. Prices for ovals and cushions. 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. 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.

Almost all sapphires 95 of them today are heat treated. In our study temperatures between 800 and 1100 c in air lightened the blue color while higher temperatures which can dissolve rutile created deeper more saturated blues. Add 8 to 10 for rounds and pears. Heat treatment from lower to higher temperatures can have a significant impact on the color of metamorphic blue sapphires from madagascar.

Pick your natural rough stones. Pockmarked facets and abnormal girdles figure 4 may also be seen if the stone has figure 3. Sellers heat or cook sapphires in their rough state before handing them to a gemcutter for faceting. Sapphire treatment guide heated.

Our natural untreated sapphires offer true beauty rarity and superior value compared to treated sapphires. Other blue sapphires heat treated material. Heat treatment in sapphires is legal and acceptable. Our sapphires are not synthetic heated to extreme temperatures diffused irradiated glass filled or oiled.

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. Add to 20 or deduct to 10 for other cutting.