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Learn about the different kinds of gemstones, their properties, colors, and sources. Browse the alphabetical list of gem profiles with photos, buying guides, and more information.
A gemstone is a mineral crystal used for jewelry or other adornments. Learn how gemstones are distinguished by their chemical composition, crystal system, color, optical phenomena, and other characteristics.
6 de may. de 2024 · Learn about the characteristics, colors, and alternatives of diamonds, sapphires, rubies, and emeralds, the four gemstones considered precious for thousands of years. Find out why they are precious, how they differ from semi-precious stones, and what factors affect their value.
Explore the science and lore of gemstones from across the globe with GIA's virtual guide. Learn about each precious stone's properties, value, sources, and more.
26 de nov. de 2019 · Learn the difference between precious and semiprecious gems, and see an alphabetical list of them with photos and chemical information. Find out which stones are hard, rare, and valuable, and which are not.
- Anne Marie Helmenstine, Ph.D.
Browse thousands of gemstones by name, color, category and shape. Find images, descriptions and prices of various gemstones, from agate to zircon.
GIA is a nonprofit organization that provides research, education and laboratory services for gemstones and jewelry. Learn about opal, lab-grown diamonds, field gemology, gem news and more from GIA experts.
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