April 15, 2026
Investment Gemstones: What Makes a Stone Valuable
Rarity, provenance, condition, market depth — the four pillars of gem investability. Case studies on Burmese rubies, Colombian emeralds, and Kashmir sapphires over the past decade.
By Certified Gemologist
Gemstones as an asset class
Coloured gemstones are a real asset class. The top origins — Kashmir sapphire, Burmese "pigeon blood" ruby, Muzo emerald, Paraíba tourmaline — have compounded value at 6–9% per year over the past two decades, roughly in line with inflation-adjusted fine-art returns. But the asset class is illiquid and opaque, and most retail buyers over-pay on entry by 30–60%.
This guide is the framework we use with clients who want to treat stones as a capital store.
What makes a stone "investment grade"
Three conditions, all required:
- Verifiable origin — Kashmir, Burma, Ceylon, Muzo, Mozambique (for specific stones). A lab report with origin determination from GRS, SSEF, or Gübelin is mandatory.
- No treatment, or minimal disclosed treatment — unheated sapphire and ruby trade at 2–4× heated equivalents. Oiled emerald is acceptable (almost universal) but the degree (minor / moderate / significant) matters.
