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Colour Gemstones


Colour Gemstones are often enhanced in the production process. Coloured Gemstones offered by Costco have been enhanced unless otherwise stated.
Commonly used treatments used to improve or alter the colour of a gemstone can include heating or dying. Please refer to the Gemstone Enhancement and Care Guide for individual gemstone information.

Care and Maintenance

  • Avoid extended exposure to direct sunlight, extreme heat, or sudden temperature changes as this may cause the gemstones to fade or break.
  • Gemstones vary in hardness and are susceptible to becoming scratched. It's important to wear and store your gemstone jewelry with care.
  • Avoid all harsh chemicals such as bleach, ammonia and hair spray as they may damage metal and gemstones.
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Colour Gemstones Care and Maintenance