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Nearly all gemstones available on the open market have been enhanced. Those that have not been
enhanced are very rare and command extravagant prices. Before buying a gemstone that has not been
enhanced ask to see a grading report, preferably one from a well-known gemstone grading lab (like
the AGTA). The grading report should state that the gem shows no indication of enhancement by heat.
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Unpolished gemstones are typically very rough. Looking at gemstones straight from the mine, they might
be mistaken for pebbles or gravel.
Almost every colored gemstone you will come across has been heat-treated. It is a common practice
around the globe and has been going on for centuries. Heating completes a process nature started, and
is used to enhance the colors of a gemstone.
The jewelry industry recognizes heating as acceptable and expected processes. Heating is part of the
standard polishing and finishing process for many gemstone varieties. The heating of gemstones is a
practice accepted by the jewelry industry, the American Gem Trade Association (AGTA), and by
Blue Nile.
For a more detailed understanding of various enhancement practices, please read the AGTA's explanation of gemstone enhancements.
Read Gemstone Care to learn how to ensure your gemstone lasts for a
lifetime.
