An Introduction to Gemology
The basic building blocks of understanding the science of gemstones.
Tahitian Pearls: Beautiful Black Pearls
With dark bodies and colorful sheens, beautiful Tahitian pearls have mesmerized jewelry lovers for decades. Learn more about these and...
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South Sea Pearls: the Complete Guide
With thick nacre and large sizes, South Sea pearls really stand out when compared to other pearl types. Learn more...
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Freshwater Cultured Pearls
As consumers compare price and quality, freshwater cultured pearls are rapidly becoming more popular than Akoyas. Learn more about these...
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Akoya Pearls: the Complete Guide
Since the beginning of the cultured pearl industry, Akoya pearls have ruled the market. Learn more about the quintessential round,...
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How Do Pearls Form?
Do pearls form around grains of sand trapped in oysters? Learn the facts about pearl formation and the various mollusks...
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Uncommon Elements Make Uncommon Gemstones
Why are some gems so rare in nature? Learn which elements in the Earth’s crust are the rarest and how...
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Desert Prospecting: Discovering California Turquoise
IGS member Richard Edley shares his experiences discovering California turquoise and offers advice on desert prospecting.
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How Do Opals Form?
Curious about how opals form and show such stunning colors? Learn about the scientific theories behind opal formation and why...
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Gemology Career Options
Thinking of becoming a gemologist? Consider these gemology career options, compare their estimated salaries, and decide which one may be...
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An Introduction to Gemology
Learn what gemologists do in our introduction to gemology. Whether your interest is casual or professional, the world of gems...
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What is Gemstone Transparency?
Gemstone transparency describes how much light passes through a gem and how it scatters. Learn what causes a gem to...
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A Brief History of Diamonds
Learn how diamonds formed geologically and how they became the virtual standard for engagement ring stones in this brief history...
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Opal and Pearl Care Guide
Opals and pearls have special setting, cleaning, and storage needs. Our opal and pearl care guide will help you keep...
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What is Gemstone Birefringence?
Gemstone birefringence is a measure of a gem's double refraction. Learn how it’s used to identify gems and see the...
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An Introduction to Fancy Gem Cuts
Rounds dominate the gem market, but fancy gem cuts offer many beautiful options. Learn about the most popular fancy shapes,...
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A Guide to Gem Cutting Styles
Gem cutting styles refer to the shape and arrangement of facets. The three most basic styles are brilliant, step, and...
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Gemstone Facets: Terminology and Functions
Not only do gemstone facets create beautiful patterns on gem surfaces, they also help gems shine. While gem cutters will...
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An Introduction to the Lapidary Arts
Lapidary is the art of working with gemstones. Learn more about the four basic lapidary arts: tumbling, cabbing, faceting, and...
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Basics of Gemstone Density and Specific Gravity
Gemologists sometimes measure gemstone density or specific gravity to help with gem identification. Learn the basics of this property and...
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Precision Faceting a Story Gemstone: Custom Faceting Advice
Your prized gemstones deserve custom faceting. Learn the benefits of working with precision faceters and tips for starting your own...
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Precision Faceting a Story Gemstone: The Faceting Process
The faceting process turns rough stones into finished gems. Learn the steps custom faceters take to create unique gemstones that...
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Precision Faceting A Story Gemstone: Faceting Equipment
Today's custom gem cutters use faceting equipment for precision work and design inspiration. Take a look at the toolkit of...
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IGS Certification Exam: Sample Gemology Questions
What does it take to become a professional gemologist? Try these sample gemology questions from the International Gem Society certification...
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Sphalerite Appraisal
Learn what factors most influence a sphalerite appraisal and what kind of jewelry will best showcase this beautiful gemstone.
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Understanding Gem Synthetics, Treatments, And Imitations, Part 2: Crystal Growth
Learn about the different crystal growth methods used to artificially create gemstones in laboratories.
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Understanding Gem Synthetics, Treatments, And Imitations, Part 3: Synthetic Diamond
Learn about synthetic diamond creation and the challenges buyers face determining whether a diamond is natural or artificial.
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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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Build Your Own Gemology Tools
Are you a hobbyist or professional gemologist facing high equipment costs? Read our IGS series of articles that can help...
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Understanding Gem Synthetics, Treatments, And Imitations, Part 1: An Introduction
Tech advances and market forces make it essential for gem buyers to know the science behind synthetic gemstones and gem...
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