The winter issue profiles corundum from Montana sapphire gravels to metamorphic ruby localities, explains the chromium and iron-titanium chemistry behind the colors, and walks through documenting a gem-grade find before it leaves your hand.
ARE Quarterly: Winter 2026 — Corundum at the Top of the Scale
A feature issue on ruby and sapphire: why corundum anchors Mohs 9, where members find it, and how to document gem-grade finds.
ARE Editorial Board
Journal article