Enhancement in colored gemstones is defined as any process apart from cutting and polishing which improves the appearance, durability, or availability of a gemstone.
Almost all available gemstones in the market are subjected to enhancement and the ones that haven’t been are truly rare and very valuable.
As a buyer, request for a grading report or analysis for a colored gemstone if you are buying a gemstone that has not been enhanced.
The grading report should affirm that the gem indicates no signs of enhancement by heat.
The jewelry industry all over the world recognizes heating as an acceptable and expected process when it comes to enhancement.
It is part of the standard polishing and finishing process for a variety of gemstones