For decades, spinel played understudy to ruby. The two gemstones are so similar in appearance that for centuries they were mistaken for one another — the famous “Black Prince’s Ruby” in the British Crown Jewels is, in fact, a spinel. The same gem that sat in the most famous crown in the world was misidentified for over 500 years.
Today, collectors and jewellery buyers who know their gemstones are increasingly choosing spinel — not as a substitute for ruby, but as a first choice. Here’s why.
What Is Spinel?
Spinel is a magnesium aluminium oxide mineral that forms naturally in metamorphic rocks, often in the same geological environments as ruby and sapphire. The most prized spinels come from Myanmar (historically Mogok), Sri Lanka, Tanzania, and Vietnam.
Like ruby, spinel owes its red colour to chromium. Unlike ruby (corundum), spinel has its own distinct crystal structure — and its own distinct optical properties. Fine spinel has a single refractive index compared to ruby’s double, meaning spinel has a unique brilliance that’s subtly different from ruby and unmistakable once you know what you’re looking at.
Available colours: While red is the most famous, spinel comes in pink, orange, blue, violet, grey, black, and a remarkable neon-pink/orange variety called “hot pink” or “neon” spinel from Mahenge, Tanzania — among the most vivid gemstones on earth.
Spinel vs Ruby: The Real Comparison
Colour
Both gemstones offer the deep red that has symbolised passion and status across cultures for thousands of years. Fine ruby — particularly “pigeon blood” red from Mogok — is unmatched in intensity when you see it in person. But fine red spinel from the same region is extraordinarily similar, and at equivalent quality levels, nearly indistinguishable to the naked eye.
The critical difference: treatment. The vast majority of commercial rubies are heat-treated — often extensively — to improve colour and clarity. Unheated, natural-colour rubies command significant premiums and require laboratory certification. Fine spinel, by contrast, is typically not treated. What you see is what the earth produced. This is a major point of difference for buyers who value authenticity.
Hardness
• Ruby: 9.0 on the Mohs scale — extremely hard, excellent durability for everyday wear
• Spinel: 8.0 on the Mohs scale — very hard, suitable for rings, earrings, pendants, and daily wear
Both are appropriate for fine jewellery intended for regular wear. The hardness difference is meaningful (ruby is significantly harder) but spinel’s 8.0 rating puts it above aquamarine, morganite, and tourmaline — all widely used in fine rings.
Price
This is where the comparison becomes most interesting.
|
Quality |
Ruby (per carat, AUD approx) |
Spinel (per carat, AUD approx) |
|
Commercial quality (heated, 1ct) |
$800–$2,500 |
$300–$800 |
|
Fine quality (heated, 1ct) |
$2,500–$8,000 |
$600–$2,000 |
|
Fine unheated, certified (1ct+) |
$10,000–$50,000+ |
$2,000–$8,000 |
The price gap between fine unheated ruby and fine unheated spinel is dramatic — and for most buyers, the visual difference is negligible. For collectors who want a natural, untreated red gemstone with documented provenance, spinel offers extraordinary value.
Rarity
At the fine gem level, both are genuinely rare. But ruby’s fame means that demand has always outstripped supply at the top end, driving prices to levels where speculation and investment motives distort the market. Spinel’s relative obscurity — until recently — means fine specimens are available at prices that reflect the gem, not the hype.
The Case for Spinel in Engagement Rings and Fine Jewellery
Unheated and Untreated
For buyers who want a stone that’s exactly what nature produced — no heat, no fracture filling, no treatment — fine spinel is an easier find than equivalent ruby. Most dealers and auction houses can confirm treatment status with a standard gem lab report (GIA, Gübelin, SSEF).
Colour Range Beyond Red
Spinel’s colour palette is exceptional. The neon Mahenge hot pink is one of the most vivid gemstones found anywhere in the world. Cobalt blue spinel from Vietnam rivals fine sapphire. Lavender and violet spinel from Sri Lanka is subtle and unique. If you want colour that’s both rare and visually striking, spinel’s range is remarkable.
Lower Competition = Better Value
The fine gemstone market is driven in part by name recognition. Ruby’s fame inflates prices at auction and in retail. For the buyer who’s done their research, spinel offers a window into the fine gemstone market at pricing that hasn’t yet caught up to the quality.
Collector Interest Is Rising
Spinel has been gaining serious collector attention for over a decade. Auction results at Christie’s, Sotheby’s, and Bonhams consistently show fine spinels achieving strong prices. The category is no longer obscure — but it hasn’t yet reached ruby’s price levels. That gap is an opportunity.
Jiaxy&K Spinel Collection
JK Store’s Jiaxy&K jewellery line features a curated selection of natural spinel in 18k gold settings — red, pink, and Mahenge neon spinel, sourced with full provenance.
Each piece is set by skilled craftspeople with attention to maximising the gem’s natural brilliance. Settings are designed to complement the stone, not overpower it.
Explore the Jiaxy&K spinel collection or contact us to enquire about a specific colour, carat size, or custom setting.
FAQs
Is spinel a good gemstone for an engagement ring? Yes — spinel’s 8.0 Mohs hardness makes it appropriate for engagement rings with reasonable care. It’s harder than most gemstones used in fine jewellery (tourmaline, aquamarine, morganite) and stands up well to daily wear. Like all fine gemstones, it benefits from occasional professional cleaning.
How do I know if a spinel is real and untreated? A reputable gem laboratory report (GIA, Gübelin, or SSEF) will confirm the stone’s identity and treatment status. When purchasing fine spinel, always request a lab report for stones over 1 carat or where treatment status matters to you.
Why is spinel cheaper than ruby if they look so similar? Primarily name recognition. Ruby’s 2,500-year history of cultural and commercial significance means buyers pay a premium for the name as much as the stone. As spinel’s profile rises among collectors, the price gap is narrowing — particularly for fine, unheated specimens.
What colours does spinel come in? Red and pink are most common, but spinel also comes in blue (including vivid cobalt blue), violet, lavender, orange, grey, black, and neon pink/orange (Mahenge). Blue spinel can rival fine sapphire; Mahenge neon spinel is among the most vivid gemstones on earth.
Does Jiaxy&K offer custom spinel jewellery? Yes. Contact the JK Store team to discuss custom settings for spinel — whether you have a stone in mind or want help sourcing the right gem for a specific piece.
The Bottom Line
Ruby’s reputation is deserved. But for buyers who value authenticity, natural colour, and extraordinary value, fine spinel makes a compelling — and increasingly mainstream — case for itself.
View the Jiaxy&K spinel jewellery collection at JK Store. Sydney showroom viewing available — contact us to book an appointment.
All prices are approximate AUD retail ranges. Fine gemstone pricing varies significantly based on origin, treatment status, colour saturation, and carat weight.