Jewelry Nomenclature: Gem Rings
Though rings may come in many styles, gem cutters will regularly encounter a few common types of gem rings. Learn how to identify these popular designs.…
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The Pocket Spectroscope: A Quick Guide for Gemologists
An inexpensive pocket spectroscope can be great for student gemologists as well as pros who need to identify gems while traveling. Learn the basics…
Modern Diamond Cut Grading Methods
The GIA modern diamond cut grading method is the most widely accepted in the industry. Our step-by-step guide covers the tools and techniques you’ll…
Serandite Value, Price, and Jewelry Information
To date, only one locality — Mont St. Hilaire, Quebec, Canada — has produced facetable serandite. These extremely rare gems are very small…
Zircon Buying Guide
Long valued for its brilliance, zircon is a natural and affordable beauty. Learn more about the quality factors for this gem in our zircon buying…
Cutting Star Gemstones: Tips for Beginners
Want to start cutting beautiful star gemstones? Here are some helpful gemological resources for novice lapidaries and jewelers.
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Gemstone Encyclopedia
Our Gemstone Encyclopedia has information on over 300 gemstones, from traditional and popular jewelry standards to collector’s stones that rarely appear for sale. Each entry has photos and detailed information about the gem’s properties. Entries for jewelry stones also have price guidelines and discussions of their most important value factors.
Emerald
Emerald has been synonymous with the color green since ancient times. A fine emerald is a truly breathtaking sight, and this member of the beryl family deserves its placement among the traditional “Big Four” gems along with diamond, ruby, and sapphire.
Onyx
For millennia, artisans have carved intricate cameos from black-and-white onyx. Solid black onyxes, faceted or cabbed, are also popular jewelry stones.
Sapphire
Few gems have held our attention over millennia as well as sapphire. The pure blue colors and excellent durability of this gem-quality member of the corundum family make for an exceptional gemstone. However, not all sapphires are blue. The September birthstone comes in every color of the rainbow (except red).
Moissanite
When it comes to engagement ring stones, there’s a lot to consider. In the moissanite vs diamond debate, we’ll look at three main factors: beauty, durability, and price.
Hematite
Hematite has a long history of use as a pigment. As a gemstone, this material is often carved but very rarely faceted. Despite its association with blood and the color red, hematite’s color can range from black and metallic gray to brownish red in thin slivers or crystals.
Diamond Cuts
We’ve compiled information on average costs and sizes for different diamond cuts and shapes at different carat weights. Learn how the different fancy cuts compare, and the pros and cons of different diamond cuts.
Moldavite
An olive to bottle-green natural glass, moldavite is a rare material popular with collectors of unusual gems as well as those interested in its formation from a meteorite impact.
Obsidian
Obsidian is the most common form of natural glass and occurs in many attractive varieties. Since prehistoric times, people have used this material to make jewelry and carvings as well as practical objects, like knives.
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