Spinel

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Spinel

Spinel Gem, Price, and Jewelry Information

Although long known best for being misidentified as ruby, the spinel gem is beautiful in its own right. Its colors,...

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Spinel Faceting Information

Spinel Faceting Information

Helpful information such as successful tips and details on how to Spinel Facet gemstones. Essential information and guides necessary for...
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Spinel Buying Guide

Spinel Buying Guide

Our spinel buying guide can help you learn how spinels are graded and how to identify a high-quality stone or...
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Identifying Synthetic Spinel

Identifying Synthetic Spinel

Synthetic spinel is a widely used jewelry stone. Learn how gemologists can identify lab-made flame-fusion, flux, and Czochralski spinels.
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Spinel Treatments and Enhancements

Spinel Treatments and Enhancements

Spinels are rarely treated, but gemologists should know how to detect spinel treatments. Learn about filling, heating, and diffusion.
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How Do Spinels Form?

How Do Spinels Form?

Available in many colors, spinels are becoming more popular with consumers. Learn how spinels form and how these gemstones get...
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What are Balas Rubies and Ruby Spinels?

What are Balas Rubies and Ruby Spinels?

For centuries, balas rubies were prized by royalty. Learn what happened after gemologists identified these gems as red spinels instead....
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Four Famous Spinels

Four Famous Spinels

Although the world’s most famous spinels are named “rubies,” these gems are distinct species. Learn the stories behind four of...
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What are Cobalt Spinels?

What are Cobalt Spinels?

Learn how gemologists identify cobalt spinels and what qualities you should look for when buying these beautiful, vivid blue gemstones....
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Choosing a Spinel Engagement Ring Stone

Choosing a Spinel Engagement Ring Stone

Our spinel engagement ring stone guide can help you learn about this beautiful, colorful, durable, but little-known gemstone.
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Spinel Inclusions

Spinel Inclusions

The materials trapped inside gems hold a wealth of information. Learn what the most common types of spinel inclusions reveal...
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Spinel

Spinel has played an important part in gem history. Prior to the last century, it was impossible to distinguish from...
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Spinel Sources

Spinel Sources

Learn about important spinel sources across the globe — from historical mines to recent discoveries — and the colors they...
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An Interview with Spinel Collector Seth Rosen

An Interview with Spinel Collector Seth Rosen

Spinel collector and gem trade expert Seth Rosen discusses the current market and potential future for this beautiful but little-known...
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What is Jedi Spinel?

What is Jedi Spinel?

Jedi spinel makes a beautiful jewelry stone. Learn how it got its name and what qualities make this vivid pinkish...
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August Birthstones: Peridot and Spinel

August Birthstones: Peridot and Spinel

What is the August Birthstone? Periodot and spinel are the modern birthstones for August. Those born in this month are...
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Gemstone Rarity and Ease of Replacement

Gemstone Rarity and Ease of Replacement

Most gemstones are rare, but some are rarer than others. Learn how gemstone rarity and ease of replacement can affect...
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Before and After: Pictures of Repaired and Recut Gems

Before and After: Pictures of Repaired and Recut Gems

Take a look at these before-and-after pics of repaired and recut gems and learn how a great lapidary can improve...
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Gemstone Refractometer Mini-Quiz

Gemstone Refractometer Mini-Quiz

Test your knowledge of refractometer gem analysis with this mini-quiz. You can review material on any question you miss at...
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Risk Management and Gem Buying for Profit

Risk Management and Gem Buying for Profit

You can’t eliminate all risks from gem investing, but understanding the risks you’ll face and your appetite for them will...
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Distinguishing Aquamarine Imitations

Distinguishing Aquamarine Imitations

How can gemologists quickly distinguish aquamarines from aquamarine imitations? We’ll review some common lookalikes and their most notable differences.
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An Update on Spinel Sold at the Las Vegas JCK Show in 2024

An Update on Spinel Sold at the Las Vegas JCK Show in 2024

Spinel has been on quite a dramatic ride! Confused with corundum for centuries, it was only identified as an independent...
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How to Polish Gems of 7-8 Hardness: Survey Results

How to Polish Gems of 7-8 Hardness: Survey Results

Some very popular jewelry stones, such as beryl, quartz, and topaz, fall in the 7-8 hardness range. You can find...
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List of False or Misleading Gemstone Names

A list of False or Misleading Gemstone Names and its Actual Gemological Name. Gathered by the source "Gemstones of the...
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How it Works: Recutting Gems to Maximize Value

How it Works: Recutting Gems to Maximize Value

Recutting gems that have been poorly cut can increase their value significantly. See how precision custom cutting can transform a...
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How to Build Pocket Crossed Filters for Gemstone Testing

How to Build Pocket Crossed Filters for Gemstone Testing

The crossed filters technique allows gemologists to detect chromium in gems. Learn how to build a portable device for conducting...
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Top Five Gemstone Investments for 2024

Top Five Gemstone Investments for 2024

What are the top gemstone investments for 2024? Learn why these five gems, some well-known and some less so, are...
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Test Taking Tips and Strategies

Learn these quick and simple test taking tips and strategies to help you on your next gemology test.
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24 Gray Gemstones (How Many Do You Know?)

24 Gray Gemstones (How Many Do You Know?)

Nothing communicates quiet luxury like jewelry set with gray gemstones. Regardless of size, gray gemstone jewelry is incredibly versatile and...
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23 Red Gemstones: Which are Best for Rings?

23 Red Gemstones: Which are Best for Rings?

If you like red, ruby isn’t your only gemstone option. Here are 23 different red gemstones. Learn which ones are...
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Synthetic Gemstone Inclusions

Synthetic Gemstone Inclusions

Identifying lab-created gems is a critical skill for gemologists. Learn how to spot the most common synthetic gemstone inclusions.
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Supply and Demand: Gemstone Market Dynamics

Supply and Demand: Gemstone Market Dynamics

The gem market can be very subjective. Nevertheless, investors can make money by starting with the basics: understanding supply and...
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Aztec Sun: Faceting Design Diagram

Aztec Sun: Faceting Design Diagram

Detailed information and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this...
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Tri-Angled Triangle: Faceting Design Diagram

Tri-Angled Triangle: Faceting Design Diagram

Details, tips, and guide on Faceting Designs. Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one...
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Diamond Oval: Faceting Design Diagram

Diamond Oval: Faceting Design Diagram

Detailed information and guide on Faceting Designs. Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one...
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Universal Oval 2: Faceting Design Diagram

Universal Oval 2: Faceting Design Diagram

Successful tips and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this...
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Pent Point: Faceting Design Diagram

Pent Point: Faceting Design Diagram

Successful tips and a guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts,...
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Zircon Sources

Zircon Sources

Zircons occur in many locations all over the world. Learn which zircon sources produce the most notable gem-quality stones.
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Gemstone Magnetism: The Forgotten Property

Gemstone Magnetism: The Forgotten Property

Although gemstone magnetism isn't commonly tested, it can help gemologists distinguish similar looking gems. Learn how to analyze this property....
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Gemstone Doublets, Triplets, and Other Assembled Stones

Gemstone Doublets, Triplets, and Other Assembled Stones

Made from two or more materials, assembled gems can make durable and affordable jewelry. Learn more about gemstone doublets, triplets,...
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Understanding Gem Synthetics, Treatments, And Imitations, Part 4: Synthetic Gemstone Guide

Understanding Gem Synthetics, Treatments, And Imitations, Part 4: Synthetic Gemstone Guide

Many varieties of gems besides diamond can be created in the laboratory. Our synthetic gemstone guide covers many examples and...
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Seasonal Favorite: Neutral Colored Precious Stones

Seasonal Favorite: Neutral Colored Precious Stones

December 15, 2023 When people think of gemstones they often think of bright red rubies, blue sapphires, green emeralds and...
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Quickie 3: Faceting Design Diagram

Quickie 3: Faceting Design Diagram

Successful tips and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this...
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Universal Oval: Faceting Design Diagram

Universal Oval: Faceting Design Diagram

Successful tips and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this...
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Striped “X”: Faceting Design Diagram

Striped “X”: Faceting Design Diagram

Detailed information and guide on Faceting Designs. Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one...
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Mineralogy of Oxides and Hydroxides

Mineralogy of Oxides and Hydroxides

Oxides and hydroxides are mineral classes that include well-known gems as well as significant ores. Learn how to identify these...
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Sword Oval: Faceting Design Diagram

Sword Oval: Faceting Design Diagram

Successful tips,details and guide on Faceting Designs. Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one...
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Twist on “CH”: Faceting Design Diagram

Twist on “CH”: Faceting Design Diagram

Successful tips and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this...
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