Gemstone composition and care

Enhancement techniques and care instructions

Gemstones are often treated to enhance the color, clarity, and stability of the stone. Heat can improve its color or clarity. The heating process has been well known to gem miners and cutters for centuries, and in many stone types heating is a common practice.

At Hannah's Gemstone Jewelry we use natural, dyed, and heated gemstones stones; which does not take away from the quality of the gems. For example:
Black onyx, carnelian, and some of the red agate have been dyed and heat treated to enhance color.
Our turquoise have been stabilized for strength.

For more information about gemstone quality and enhancements you can view this handy booklet in PDF from The American Gem Trade Association at

The appropriate letter coding will appear next to the gemstone name accordingly on our website, in some cases we will also use plain text.

Dyed: (D)
Dyed and heated: (D/H)
Natural: (N)

Terms used in the Art of Jewelry-making
Gems or Gemstones: Are pieces of naturally occuring stones or rocks which have been cleaned and polished to use in more
Nugget: Can be found as large chunks or small chips of gemstones or glass.
Semi-precious: In modern times, this is any gem other than diamond, ruby, pearl, sapphire, emerald or opal.