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.
4Articles
59Topics
Find your birthstone
Tap a month to explore its gem
Start Here
The Essential Guides
New to fine jewelry? These cornerstone guides cover the fundamentals worth knowing first.
Pillar Guide
Opal
Sort
-
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 → -
Buying Guides
How to Buy Opal Jewelry: White, Black, Doublets & How to Choose the Right Stone
Opal is judged on play-of-color, not the 4Cs. Learn white versus black opal, how solid stones differ from doublets and triplets, and how to care for a soft gem.Read article → -
Birthstones
October Birthstone: Opal Meaning, Color & Jewelry
Opal is the birthstone for October, with tourmaline as the alternate. Its meaning, play-of-color, hardness, and how to care for opal jewelry.Read article → -
Gem Quality
How to Evaluate Opal Quality: Play-of-Color, Body Tone & Pattern
What makes a quality opal: how play-of-color and brightness lead, why black opal is most valued, the doublet and treatment questions, and the care it needs.Read article →
◆
No articles match yet. Try another topic or search term.
Oath Jewelry
Find the piece worth the moment
When the occasion matters, the piece should too. Explore fine jewelry in solid gold, platinum, and sterling silver, set with genuine gemstones.
Browse the catalog