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GIA’s Gem Encyclopedia is a virtual journey through the science and lore of gemstones from across the globe. Each precious stone page features additional detailed gemological information, a buyer’s guide, photos, videos & research.
- English
Iolite gemstone is the gem-quality variety of the mineral...
- Topaz
Topaz is a precious stone, typically colorless, yellow & is...
- Turquoise
Turquoise is an opaque colored stone that can be marketed...
- Alexandrite
Alexandrite Gemstone is a rare variety of the mineral...
- Tanzanite
Tanzanite is an extraordinary gemstone, its appearance is...
- Gem Encyclopaedia
GIA’s Gem Encyclopedia is a virtual journey through the...
- English
New to gemstones? Curious about the different kinds of gemstones? Check out our gemstones list and discover a world of precious and semi-precious stones.
A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or polished, is used to make jewelry or other adornments.
26 de nov. de 2019 · Learn about the chemical, physical, and crystal properties of various gemstones, from diamond to zircon. Find out which ones are considered precious and which ones are semiprecious, and see examples of each.
6 de may. de 2024 · Learn about the characteristics, colors, and alternatives of diamonds, sapphires, rubies, and emeralds, the four gemstones that are traditionally considered precious. Find out why they are valued for their beauty, rarity, durability, and symbolism.
Whether you choose to adorn yourself in precious diamonds and emeralds or equally beautiful semi-precious stones, their true value is how they make you feel. Let your intuition guide you as you find the perfect gem for you!
11 de may. de 2018 · What stones are considered precious and which are those considered semi precious? A true stone designation is complex considering that some are said to be precious, others to be semi-precious, more are considered fine or ornamental.
