Expertise
Gemology, in plain language
No buyer's guide fluff. Articles are written by our credentialed gemologists and cover what we actually tell clients when they pick up the phone — from origin premiums and treatment disclosure to how to read a GRS report.
April 20, 2026
Alexandrite: The Stone That Changes Colour with the Light
Named after Tsar Alexander II, alexandrite is among the rarest phenomena in the gem world. A fine stone appears emerald green in daylight and transforms to a vivid raspberry red under incandescent light...
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April 19, 2026
Kashmir Sapphires: Why This Origin Commands a Premium
The term 'Kashmir' in the gemstone world is synonymous with the finest blue sapphire ever unearthed. Mined for only a brief period in the late 19th century, these stones remain the benchmark for blue...
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April 18, 2026
The Pigeon Blood Ruby: Understanding the World's Most Coveted Colour
Of the many qualities that define an exceptional ruby, colour reigns supreme. The term "pigeon blood" has been used for centuries to describe the most prized shade — a pure, vivid red with a hint of blue...
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April 18, 2026
Gemstone Glossary: Trade Terms A to Z
The vocabulary you'll meet on product pages and lab reports, explained in plain English.
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April 18, 2026
How to Buy on TopGems: The Full Walk-Through
From browse to delivery — reservations, KYC, payment methods, shipping, insurance, returns. Every step explained.
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April 18, 2026
Certification Explained: GIA, GRS, SSEF, Gübelin and the Rest
Which gem labs matter, what each specializes in, how to verify a report online, and why a certificate is worth the fee above 1 carat.
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The Diamond 4C Guide: Carat, Cut, Color, Clarity
The four axes that determine every diamond price. Plain-language grading, what moves the needle, and how to read a GIA or IGI report.
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Gemstone Guide: Ten Stones Every Collector Should Know
A working reference for the ten colored gemstones we carry most often — hardness, key origins, common treatments, and what to look for when buying.
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Investment Gemstones: What Makes a Stone Valuable
Rarity, provenance, condition, market depth — the four pillars of gem investability. Case studies on Burmese rubies, Colombian emeralds, and Kashmir sapphires over the past decade.
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April 11, 2026
Understanding Gemstone Certifications: GIA vs GRS vs SSEF
A practical comparison of the three most authoritative laboratories in colored stone trading — what they test, how their reports differ, and when each matters for serious buyers.
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How to Choose a Natural Sapphire: Expert Guide
From Kashmir cornflower to Ceylon royal blue — a gemologist's framework for evaluating origin, color, clarity, and heat treatment when selecting a sapphire for collection or investment.
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