Tag

gemology

2 articles

Understanding·July 19, 2026·7 min read

Sapphire and Ruby: The Two Faces of Corundum

Sapphire and ruby are one mineral wearing two colours. Here is how a trace of chromium turns corundum red, and where the line between pink sapphire and ruby actually sits.

Specialty Stones·April 18, 2026·10 min read

Spinel vs Sapphire: The Misidentified Royal Gem

Spinel is a separate mineral from sapphire, but for centuries the two were confused in royal jewelry. Here is how to tell them apart, why spinel commands a fraction of sapphire's price, and why Sri Lankan red spinel is one of the most undervalued natural gemstones today.

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