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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The Essential Guides
New to fine jewelry? These cornerstone guides cover the fundamentals worth knowing first.
Pillar Guide
Onyx
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Gem Quality
How to Evaluate Onyx Quality: Color Uniformity, Surface Finish & What to Look For
What makes a fine onyx: an even, deep black with a high glassy polish, why almost all black onyx is dyed chalcedony, and the care its softer surface needs.Read article → -
Buying Guides
How to Buy Onyx Jewelry: Dyed Black, Banded Varieties & What to Look For
Commercial black onyx is dyed chalcedony, a stable and accepted treatment. Judge it on even color and a clean, bright polish, and protect a stone that can scratch.Read article →
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