For example, baking jewelry is allowed. Almost all rubies on the market are baked, such as beeswax, agate, Hong Fei, topaz, tanzanite and laser pearl. ...
Baking (heat treatment) is defined as "optimization method" in the name of jewelry and jade, which is a "traditional and acceptable treatment method" and can be equivalent to selling "natural" amber products without prior explanation. In other words, there is no need to tell consumers at the time of sale that the baked beeswax has been treated. Because baking (heat treatment) does not change the physical and chemical properties of amber, it only deepens its color. Some experts in the industry compare the baking of amber to "makeup" and the suppression of amber to "cosmetic surgery". No one will mind marrying a daughter-in-law and putting on makeup, but it's best to explain in advance.
Baked beeswax
Ruby original stone
Roasted ruby
The burning color of jadeite is the most common. Fei color of natural red is dark, so heat treatment improves the brightness of red. The color after burning is still very stable.
Most tanzanite in the tanzanite market is heat-treated. But it didn't affect its value. Because the primary color of tanzanite is not beautiful.
Topaz The blue, yellow and red topaz we usually see are all artificially colored. However, his main discoloration method is irradiation treatment. After irradiation treatment, baking process is often used to eliminate the yellow tone in topaz through high temperature, so that the brown color produced by irradiation becomes stable blue.