History's Great Imposter
For centuries, some of the world's most famous "rubies" were actually spinel. The "Black Prince's Ruby" in the British Imperial State Crown and the "Timur Ruby" are both red spinels. It wasn't until modern gemology that spinel was recognised as a distinct — and wonderful — gem in its own right. Sri Lanka has long been a source of fine spinel.
Spinel is a separate mineral from corundum, with a hardness of 8, and it is never treated or heated in the way sapphires often are — so a fine spinel is almost always 100% natural. This is part of its growing appeal.
A Rainbow of Colours
- Red & hot pink — the most valuable, rivalling ruby
- Vivid "cobalt" blue — rare and highly sought after
- Lavender, purple, mauve, and grey — beautiful and affordable
What Affects Value
- Colour — vivid reds and cobalt blues top the list.
- Clarity — spinel is often very clean.
- Cut & carat — bright, well-cut larger stones command more.
Why Collectors Love It
Spinel offers ruby-like beauty, excellent durability, and natural (untreated) origin — often at a fraction of ruby's price. It's one of the smartest buys in coloured gems.
See the Source
Browse Ratnapura accommodation and the Island of Gems overview.
Quick Facts
| Mineral | Spinel (its own species) |
| Colours | Red, hot pink, cobalt blue, lavender, grey |
| Hardness | 8 (Mohs) |
| Treatment | Typically none — usually 100% natural |
| Main SL source | Ratnapura gem fields |
| Famous for | Once mistaken for ruby (Crown Jewels) |
Frequently Asked Questions
Was spinel really mistaken for ruby? Yes — famous "rubies" like the Black Prince's Ruby in the British crown are actually red spinels.
Is spinel treated like sapphire? Usually not — fine spinel is almost always natural and untreated, which adds to its appeal.
Which spinel colours are most valuable? Vivid reds, hot pinks, and cobalt blues top the list.
Is spinel a good value gem? Very — it offers ruby-like beauty and great durability, often at a fraction of ruby's price.