THE JGRL GEM LIBRARY
Get to know gemstones.
Discover the reasons for their beauty.
The structure behind a color. The place a gem formed. The cut that brings out its light.
A collection of fundamentals to help you understand each stone.
Crystals / Origins / Colors / Hardness / Cuts
EXPLORE THE GEMSTONES
Explore gemstones
Search by name or color to discover a gemstone.
Amethyst
Amethyst
Purple quartz, sharing its mineral identity with citrine. Color zoning and growth patterns may be present.
- Mohs hardness
- 7
- Crystal system
- Trigonal
Citrine
Citrine
Yellow to orange quartz. It is a different mineral from topaz, even when their colors look similar.
- Mohs hardness
- 7
- Crystal system
- Trigonal
Illustrations suggest color and shape. Individual stones vary; each gem page includes further details and references.
A LITTLE KNOWLEDGE, A DEEPER APPRECIATION
The more you know,
the more there is to discover.
How do hardness and toughness differ?
Understand the language of gems, one idea at a time.