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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,...
View ProfileSpinel 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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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 Buying Guide
Master spinel buying with our comprehensive guide covering the 4 Cs, color grading, pricing, origins, and how to identify quality...
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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?
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?
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
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?
Learn how gemologists identify cobalt spinels and what qualities you should look for when buying these beautiful, vivid blue gemstones....
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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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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
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 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
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?
Jedi spinel makes a beautiful jewelry stone. Learn how it got its name and what qualities make this vivid pinkish...
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Red Gemstones: Ruby, Spinel, Garnet, and Other Great Picks for Jewelry
Red gemstones are popular choices for engagement rings and fine jewelry. The three most popular stones are ruby, garnet, and...
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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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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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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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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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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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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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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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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
Recutting gems that have been poorly cut can increase their value significantly. See how precision custom cutting can transform a...
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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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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 2025
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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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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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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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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Identifying Inclusions of Specific Gems
Some natural as well as synthetic gems have specific, characteristic inclusions. Learn the identifying inclusions of some of the most...
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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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Mixed up Square : 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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Line Point Triangle: Faceting Design Diagram
Helpful tips and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this...
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Cut Corner Pent: 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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Point Mounty: 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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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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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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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
Detailed information and guide on Faceting Designs. Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one...
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Shadow Box Triangle: Faceting Design Diagram
Helpful tips and guide on Faceting Designs. Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one...
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Seagull Variation: Faceting Design Diagram
Successful tips and guide on Faceting Designs. Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one...
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“3LD” Triangle: Faceting Design Diagram
Detailed information and guide for Faceting Design Diagrams. This facet design is called a " "3LD" Triangle". This design is...
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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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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
Successful tips and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this...
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Icon Square: 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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