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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Find your birthstone
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The Essential Guides
New to fine jewelry? These cornerstone guides cover the fundamentals worth knowing first.
Pillar Guide
Tanzanite
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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 → -
Buying Guides
How to Buy Tanzanite: Understanding Its Rarity and Choosing a Stone You'll Keep
How to buy tanzanite jewelry: why its single source makes it finite, prioritizing rich blue-violet color, why heat is standard, plus settings and budget.Read article → -
Gem Quality
How to Evaluate Tanzanite Quality: Trichroism, Color Zoning & Clarity
What makes a quality tanzanite: how color leads, why trichroism makes the cut a color decision, the heat and coating disclosures, and the care it needs.Read article →
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