Gemstone Guides

GIA, IGI HRD and Other Labs – Who to Trust When It Comes to Your Gemstone

Send the same ruby to two respected laboratories and you may get two different reports, both honest. Learn why gemological reports disagree on origin and color names, which laboratory suits which s...

Why Certification Matters – Confidence You Can Hold in Your Hands

Two three-carat blue sapphires can look identical and differ fifteen-fold in price, because the facts that decide value are invisible: treatment, origin, natural versus synthetic. Learn what a gemo...

Birthstones and Their Meaning – Gems That Belong to You

Ask three sources for December's birthstone and you may get three answers. The modern list is barely a century old, has been revised twice in living memory, and descends from a breastplate describe...

Understanding Gemstone Color

Pure corundum is colorless. Remove a few atoms of chromium and a ruby becomes a worthless crystal. Learn where gemstone color actually comes from, why blue sapphire is created by a conversation bet...

Gemstone Density: The Specific Gravity Chart and Why It Matters

Density is the one gemstone property that cannot be faked and cannot be improved. It explains why a one-carat sapphire faces up smaller than a one-carat diamond, how a glass imitation gives itself ...

Understanding Gemstone Hardness – The Mohs Scale and Jewelry Durability

Household dust contains quartz, which means any gemstone softer than 7 slowly loses its polish just from being worn. Learn how hardness differs from toughness and stability, why topaz splits despit...

Gemstone Origins & Rarity – The Power of Place

Two blue sapphires, identical to any eye that is not a laboratory's, can differ tenfold in price because of a single word: Kashmir. Learn how laboratories actually determine origin, why it remains ...

Treated vs. Untreated Gemstones – What You Deserve to Know

Roughly 95 percent of colored gemstones have been treated, and the practice is thousands of years old. Learn which treatments the trade accepts, which place a stone outside fine jewelry, what heat,...

What is a Natural Gemstone?

A stone can be advertised as genuine, real, created or cultured, and not one of those words tells you reliably what it is. Learn what natural actually means, why treated stones are still natural, a...

Carats Explained: ct vs K, and Why a Carat Isn't Always the Same

The same word does two unrelated jobs: one measures how much of a metal is gold, the other measures how heavy a stone is. This guide explains why a one-carat sapphire faces up smaller than a one-ca...