Spinel
The great imposter — historically mistaken for ruby and sapphire, now prized in its own right.
Spinel is a magnesium aluminum oxide mineral that occurs in a stunning range of colors — vivid red, hot pink, cobalt blue, lavender, and gray. For centuries, the world's most famous 'rubies' were actually spinels: the Black Prince's Ruby in the British Imperial Crown and the Timur Ruby are both red spinels. Modern gemology has given spinel its own identity, and it has rapidly become one of the most sought-after collector's stones. Spinel requires no treatment — it comes out of the ground in vivid, natural color — and its excellent hardness (8) makes it ideal for jewelry.
Physical Properties
| Hardness (Mohs) | 8 |
| Refractive Index | 1.712–1.736 |
| Specific Gravity | 3.58–3.61 |
| Crystal System | Cubic (Isometric) |
| Chemical Formula | MgAl₂O₄ |
Color Varieties
Major Sources
Myanmar · Tanzania (Mahenge) · Sri Lanka · Vietnam · Tajikistan
Pricing Factors
Color
Vivid red and cobalt blue spinels command the highest prices. Mahenge hot pink is also premium. Lavender and gray are more accessible.
Size
Fine spinel above 3 carats is rare. Above 5 carats, prices escalate dramatically for top colors.
Treatment Status
Spinel is one of the few gemstones that is almost never treated. This natural purity is a key selling point.
Origin
Burmese 'Jedi' red spinels and Mahenge pink spinels carry the strongest origin premiums.
Care Instructions
Do
- Clean with warm soapy water and a soft brush
- Ultrasonic cleaning is generally safe
- Excellent for everyday wear — very durable
Don't
- Avoid extreme heat
- Don't use steam cleaners unnecessarily
- Handle with care to avoid chipping (though spinel is quite tough)
Cleaning Method
Warm soapy water or ultrasonic. Spinel is durable and easy to care for.
Insider Buying Tips
Spinel is the insider's gemstone — the trade knows it's undervalued relative to ruby, sapphire, and tourmaline.
Mahenge hot pink spinel offers an electric pink that's unmatched by any other gemstone at any price.
Red spinel is the ethical, untreated alternative to ruby — similar look, no treatment, and better value.
Cobalt blue spinel has a unique neon quality — it's completely different from sapphire blue.
Buy spinel now — prices have risen 300–500% in the past decade and the trend shows no signs of slowing.
Did You Know?
The 170-carat Black Prince's Ruby in the British Crown is actually a red spinel.
Spinel wasn't formally distinguished from ruby until 1783 when mineral analysis advanced.
Mahenge, Tanzania, produced a famous pocket of neon pink spinels in 2007 that sent prices soaring.