How do you tell if a stone has been heat treated?
The destruction of gas or fluid inclusions or the dissolving of mineral inclusions are clues to heat treatment. For gems that contain rutile needles, the needle margins may become diffuse. On rubies, inclusions may be found that are glassy in appearance.
Do heat treated gemstones fade?
The color of a heat-treated sapphire will remain permanent and will not change or fade unless the stone undergoes a secondary treatment. This is the reason why heat treatment on sapphires is accepted by most retailers.
What does heat treated sapphire mean?
Heat Treating sapphires is a standard industry practice that improves the clarity and enhances the color of sapphires from Gem Mountain. 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.
What happens when you heat labradorite?
Labradorite is created when heat and pressure melt and mix various rocks and minerals. As the newly mixed materials slowly cool, the minerals separate into layers and this now, igneous rock, hardens with several inclusions. It is the layers that will later give the gemstone its shimmering color play.
Can Sunstone be dyed?
Sunstone and Oregon Sunstone
Although there are no known treatments for sunstones or Oregon sunstones, some feldspars may be enhanced with copper diffusion. This treatment gives them an intense red color similar to some natural-color Oregon sunstones.
Why are gemstones dyed?
A gemstone is considered dyed, by AGTA guidelines, when coloring matter has been introduced into the stone to give it new color, intensify its present color or improve its color uniformity. According to AGTA, a gemstone is considered heated when heat is used to create a change in color, clarity and/or phenomena.