The Oath Journal
Fine Jewelry, Explained
Buying guides, gemstone deep dives, metal know-how, and styling advice from the Oath team. Everything you need to choose, wear, and care for fine jewelry with confidence.
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New to fine jewelry? These cornerstone guides cover the fundamentals worth knowing first.
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Gem Identification
How to Tell If a Ruby Is Real: At-Home Tests and What the Results Actually Tell You
Learn how to tell if a ruby is real: at-home loupe tests for natural inclusions, the tells of synthetic and simulant stones, and when a GIA report is worth it.Read article → -
Gem Identification
How to Tell If a Sapphire Is Real: Authentication Tests and What to Look For
Learn how to tell if a sapphire is real: at-home loupe tests, the difference between natural, heated, and synthetic stones, and when to get a lab report.Read article → -
Emerald
Real vs Fake Emerald: How to Identify a Genuine Emerald
Real vs fake emerald: how to spot a genuine emerald by its jardin inclusions, why oiling is normal, the signs of synthetics and glass, and when to get a report.Read article → -
Diamond
How to Tell If a Diamond Is Real: Tests That Actually Work and What to Do Next
How to tell if a diamond is real: the fog test, what a diamond tester can and cannot prove about moissanite, why lab-grown diamonds are real, and when to get a re...Read article → -
Gem Identification
Natural vs Lab-Grown Sapphire: How They Differ and How to Choose
Natural vs lab-grown sapphire: both are real corundum. How lab sapphires are made, the inclusions that tell them apart, what created means, and how to choose.Read article → -
Amethyst
Genuine vs Synthetic Amethyst: How to Tell Real Quartz from Lab-Grown
Genuine vs synthetic amethyst: real amethyst is purple quartz. Spot color zoning and double refraction, why lab amethyst is everywhere, and when to get a report.Read article → -
Gem Identification
Real vs Fake Tanzanite: How to Tell the Difference
Genuine tanzanite is heat-treated blue-violet zoisite from one Tanzanian source. Learn how trichroism, hardness, and provenance tell real stones from fakes.Read article → -
Gem Identification
Genuine vs Synthetic Opal: How to Tell the Difference
Genuine opal is hydrated silica with true play-of-color. Learn to spot synthetic Gilson opal, doublets, triplets, and plastic imitations from the real stone.Read article → -
Gem Identification
Real vs Fake Turquoise: How to Tell the Difference
Genuine turquoise is a porous copper-aluminum phosphate, usually stabilized. Learn how matrix, hardness, and a dye test reveal real stones from dyed howlite.Read article → -
Gem Identification
Natural vs Lab-Grown Ruby: How to Tell the Difference
Natural and lab-grown ruby are both genuine corundum colored by chromium. Learn how inclusions, growth lines, and lab reports tell mined from synthetic.Read article → -
Alexandrite
Natural vs Synthetic Alexandrite: How to Tell the Difference
Natural alexandrite is color-change chrysoberyl. Learn how to tell it from synthetic chrysoberyl and the color-change corundum simulants sold as alexandrite.Read article → -
Garnet
Real vs Fake Garnet: How to Identify Genuine Garnet and Its Simulants
Genuine garnet is a natural silicate group, singly refractive at Mohs 6.5 to 7.5. Learn how to tell real garnet from red glass, doublets, and other simulants.Read article → -
Emerald
Natural vs Lab-Grown Emerald: What the Difference Means for Buyers
Natural and lab-grown emerald are both genuine beryl colored by chromium. Learn how inclusions, growth structure, and lab reports tell mined from synthetic.Read article → -
Gem Identification
Simulant vs Synthetic vs Natural Gems: Understanding the Three Categories Every Buyer Should Know
Natural, synthetic, and simulant gems are three different things. Learn what sets each category apart, why disclosure matters, and how to buy with confidence.Read article →
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