Spinel
Everything You Need To Know
Table of Contents
- What Is Spinel?
- The History of Spinel: From Misidentification to Majesty
- Where Does Spinel Come From?
- What is Mahenge Spinel?
- What Is Cobalt Spinel?
- Spinel VS Sapphire
- Is Spinel Suitable for an Engagement Ring?
- Why Collectors are Paying Attention to Spinel
- Buy Natural Spinel Gemstones
It was one conversation that changed everything.
It was in 2017 that I first heard mention of the precious gemstone spinel. I had planned to travel to Sri Lanka to buy sapphires, and before I left, I had a casual conversation with a family friend who happened to be a gemologist. I asked her opinion on buying gems in Sri Lanka and if there were any gem types she would recommend.
Her instant reply was “Spinel.”
Spinel, she said, was still undervalued. It was an upcoming gemstone on a trajectory to compete with fine sapphires. Spinel was the gemstone to invest in.
Her advice stayed with me, and when I established The Sapphire Merchant in 2021, spinel, alongside sapphires, became an important part of my inventory. Since then, I have watched spinel move from an insider secret to a serious collector gemstone.
Sapphires, rubies, emeralds, and diamonds are well known in New Zealand and are the go-to gemstones for creating custom jewellery. However, spinel is still relatively unfamiliar to the Kiwi collective.
We are passionate about gemstone education and raising the profile of lesser-known beautiful precious gemstones. Spinel is one of the great coloured gemstone stories of our time — and here is why collectors are paying attention.
1. What is Spinel?
Spinel is a natural gemstone known for its brilliance, clarity, and an extraordinary spectrum of colours, ranging from Jedi red and cobalt blue to lotus pink, royal purple, soft lavender, and even gunmetal grey.
Although spinel is frequently mistaken for ruby or sapphire, it is a completely different mineral species with its own chemical composition, crystal structure, and optical properties. Spinel belongs to the spinel mineral group and has the chemical formula MgAl₂O₄ (Magnesium Aluminium Oxide), whereas ruby and sapphire both belong to the corundum family.
For centuries, spinel was mistaken for other precious stones, notably rubies and sapphires, due to its colour resemblance and because it was mined from the same alluvial and gravel deposits as corundum. Without modern gemological tools, spinel and ruby were distinguished by appearance alone, making cases of mistaken identity remarkably common.
Spinel possesses an exceptional ability to reflect light, with a refractive index close to sapphire. This gives it a fiery sparkle that rivals sapphires and garnets.
In cobalt-bearing spinel, trace cobalt replaces elements within the crystal structure, creating an exceptionally vivid blue — one of the rarest and most coveted colours in the spinel family. These minerals create a steely brilliance as light refracts through the gemstone, and this metallic shimmer is what differentiates a spinel from a sapphire.
Historically overshadowed, spinel has gained well-deserved recognition in modern times. Here at The Sapphire Merchant, we incorporate spinel into our custom jewellery designs, as other leading maisons have embraced it for its prestige, beauty, and durability.
As demand surges and supply chains remain limited, fine spinel is becoming a serious competitor to sapphires and rubies for its use in luxury jewellery pieces and as an investment-grade gemstone.
Spinel at a Glance
Chemical Composition: MgAl₂O₄ (Magnesium Aluminium Oxide)
Crystal System: Cubic
Refractive Index: 1.72–1.73
Specific Gravity: 3.61–3.67
Double Refraction: None (Isotropic)
Mohs Hardness: 7.5–8
Lustre: Vitreous
2. The History of Spinel: From Misidentification to Majesty
The name spinel comes from the Latin spinella, meaning “little thorn”, possibly referring to the sharp points of a spinel’s cubic crystal.
Spinel has a long and fascinating history.
For centuries, spinel was mistaken for ruby. Modern gemological testing now makes it easy to distinguish between corundum and spinel. Still, pre-modern gemology made it almost impossible to tell the difference, as spinel was found in the same geological deposits as sapphires and rubies.
Red spinel and ruby frequently occur in marble-hosted deposits within the same mining regions, and both contain chromium, creating rich red colours that can appear strikingly similar.
One of the most well-known cases of spinel’s mistaken identity was the Black Prince’s Ruby.
History tells us that this superb red spinel (assumed to be a ruby) was gifted to Edward of Woodstock, better known as the Black Prince, by Pedro the Cruel, King of Castile, following the Battle of Nájera in 1367.After the Black Prince’s death, the English Crown inherited the gemstone, and King Henry V wore it set into his helmet at the Battle of Agincourt in 1415. According to chronicles, he was struck on the head by a French axe, but the stone survived, cementing its place in legend.
Today, the Black Prince’s Ruby still sits in the Imperial State Crown of Britain above the Cullinan II diamond.
Until the nineteenth century, it was believed to be a ruby. Modern gemological testing eventually revealed that this famous “ruby” was actually a spinel.
Another famous case of mistaken identity is Catherine the Great’s “ruby”, the glittering showpiece of the Russian Imperial Crown.
This remarkable gemstone is actually a 398.72-carat red spinel, the second-largest example in the world. At the time, spinel was known as “Balas Ruby”, taking its name from the famous mines in present-day Afghanistan.Russian envoy Nikolai Spafary acquired the gemstone in China in 1676 while conducting trade negotiations with the Emperor. Catherine the Great later commissioned the Imperial Russian Crown for her coronation, where the magnificent spinel became its centrepiece.
It survived the Russian Revolution and today remains on display in Moscow’s Kremlin Armoury.
Spinel was finally recognised as a distinct gemstone species in the mid-1800s, marking a turning point in its journey toward recognition.
3. Where Does Spinel Come From?
Spinel is mined in geological localities across the globe, but only a handful of origins have become legendary for producing truly exceptional gemstones. Here at The Sapphire Merchant, we believe Myanmar (Burma), Sri Lanka, Tanzania, Vietnam and Tajikistan represent the world's premier sources of fine gem-quality spinel, each renowned for its own unique colours, character and collector appeal.
Burmese Spinel
Burmese Spinel is the name given to spinel mined from Myanmar, a country widely regarded as one of the world's most important sources of fine gem-quality spinel. For centuries, Myanmar's marble-hosted deposits have yielded some of the most extraordinary spinels ever discovered.
This origin is especially famous for its gunmetal greys and its legendary red Jedi Spinel. Burmese spinel is also found in a beautiful range of pink, violet, lavender and blue hues, often displaying exceptional brilliance, transparency and crystal quality.
Jedi Spinel was a name coined by respected field gemmologist Vincent Pardieu. Jedi Spinel is an electric pinkish-red spinel that "doesn't go to the dark side", meaning it remains vivid and fluorescent without developing the dark or inky tones often seen in other red gemstones. The finest examples appear to glow from within, displaying an intensity of colour that has made Jedi Spinel one of the most sought-after coloured gemstones in the world.
The Mogok Stone Tract, often referred to as the "Valley of Rubies", is Myanmar's most famous gemstone-producing region. While celebrated for its exceptional rubies, Mogok has also produced many of the world's finest spinels, with both gemstones forming together within the same marble deposits. It is this remarkable geology that led to so many historic spinels being mistaken for rubies before the science of modern gemmology.
Here at The Sapphire Merchant, the majority of our spinel collection has been sourced from Burma. We are continually drawn to the remarkable quality of Burmese spinel, whose vivid colours, exceptional brilliance and enduring rarity make it one of our favourite gemstones to source for collectors and bespoke jewellery commissions.
Sri Lankan Spinel
Sri Lanka has been celebrated as one of the world's most important gemstone-producing countries for more than 2,000 years. Often referred to as the "Jewel Box of the Indian Ocean", its gem-rich alluvial deposits have produced an extraordinary array of precious gemstones, including some of the world's finest sapphires, alexandrites, chrysoberyls and spinels.
Sri Lanka produces a remarkable variety of spinel colours and is especially well known for its spectacular shades of blue spinel. The country's deposits have yielded everything from delicate pastel lavender and soft pink spinels to vivid violet and exceptional blue gemstones, making it one of the most diverse spinel origins in the world.
Sri Lanka is also renowned for producing cobalt spinel, a rare variety of blue spinel containing trace amounts of cobalt that creates a pure, vivid and highly saturated blue with no modifying grey. These remarkable gemstones possess an exceptional intensity of colour, appearing almost electric in certain lighting conditions.
True cobalt spinel is exceptionally rare. A gemological laboratory can confirm the presence of cobalt using advanced spectroscopy; however, to the naked eye it has vivid, medium saturation, medium tone and extraordinary brightness.
As collectors continue searching for rare natural blue gemstones beyond sapphire, fine Sri Lankan blue and cobalt spinels have become increasingly sought after.
Tajikistan Spinel
For centuries, the remote mountains of present-day Tajikistan have been associated with some of the world’s most legendary spinels. The historic Kuh-i-Lal deposit, located high within the Pamir Mountains, has produced extraordinary red spinels for more than 1,000 years and is widely regarded as one of the most significant spinel localities in history.
Historically, these remarkable gemstones became known as “Balas Rubies”, a name derived from Badakhshan, the ancient region spanning parts of present-day Tajikistan and Afghanistan, where many of the world’s finest red spinels were discovered. Long before the science of gemmology existed, these magnificent spinels were treasured as rubies by emperors, kings and royal families, their true identity remaining unknown for centuries.
Many of the world’s most famous historic spinels, once believed to be rubies, are thought to have originated from this remarkable region. Before the development of modern gemmological testing, these extraordinary gemstones adorned royal collections throughout Europe, the Middle East and Asia, cementing their place among history’s most celebrated crown jewels.
Tajikistan is best known for producing vibrant red to pinkish-red spinels with exceptional transparency and brilliance. The finest examples display rich, saturated colour that has captivated collectors for centuries.
Although mining continues today, production remains extremely limited, and fine gem-quality material is rarely seen on the international market. As a result, spinel from Tajikistan is highly regarded not only for its beauty but also for its extraordinary historical significance.
For collectors, owning a spinel from Tajikistan is owning a gemstone from one of the most important chapters in coloured gemstone history. This legacy stretches back through royal treasuries, ancient trade routes and some of the world’s most celebrated crown jewels.
Tanzanian Spinel
Tanzania has become one of the world's most important sources of fine spinel, producing gemstones desired for their colour, clarity and brilliance. Although spinel is unearthed from several regions throughout the country, it is the Mahenge region that has firmly established Tanzania on the international stage.
Since the discovery of gem-quality spinel in Mahenge in the early 2000s, the region has earned a reputation for producing some of the finest pink spinels ever unearthed. These remarkable gemstones have attracted collectors around the world with their vivid hot pink and intense fluorescense (caused by high levels of chromium in the crystal).
Tanzania is also an important source of cobalt-bearing blue spinel. Although considerably rarer than its famous pink counterpart, Tanzanian cobalt spinel displays an intensely saturated blue.
Vietnamese Spinel
Vietnam has earned an outstanding reputation for producing some of the world’s finest spinel, particularly from the Luc Yen mining district in northern Vietnam. Although production is relatively small, Luc Yen has become synonymous with exceptional gem-quality spinel, producing gemstones with remarkable clarity, brilliance and colour.
Luc Yen is especially celebrated for its vivid cobalt-blue spinel. These extraordinary gemstones display an intensely saturated blue with exceptional transparency and brilliance, making them among the most sought-after blue spinels in the world. The district is also known for producing beautiful pink, red, lavender and violet spinels, demonstrating the remarkable diversity of colours found within a single locality.
Much like the famed ruby and sapphire deposits of Asia, Luc Yen’s spinels are recovered from both primary marble-hosted deposits and secondary alluvial gravels, where generations of local miners continue to uncover these remarkable gemstones by hand.
Due to the limited production from Luc Yen and growing international demand, fine Vietnamese spinel has become increasingly difficult to source. Today, gemstones displaying exceptional colour, high clarity and strong saturation are highly prized by collectors and luxury jewellery houses alike.
Spinel buying at the Chanthaburi Gems Market in Thailand.
Sorting through a lot of Grey Spinel at Chanthaburi Gems Market in Thailand.
4. What is Mahenge Spinel?
Mahenge Spinel is the name given to vivid pink spinel mined from the Mahenge region of central Tanzania. Since its discovery in 2007, Mahenge Spinel has become one of the most exciting coloured gemstones in the world, captivating collectors and gem enthusiasts with its extraordinary colour and brilliance.
The finest Mahenge Spinels display an electric hot pink to slightly orangey-pink hue with exceptional saturation and a remarkable glow. Many possess an almost neon-like appearance, often compared to the famous Paraiba tourmaline for their vivid fluorescence and ability to appear luminous, even in low light.
One of Mahenge Spinel’s most interesting characteristics is its exceptional fluorescence. The finest gemstones emit a vibrant red glow when viewed under longwave ultraviolet (LWUV) light, a natural reaction caused by trace amounts of chromium within the crystal. This same chromium is also responsible for the gemstone’s unmistakable “neon” appearance, giving exceptional Mahenge Spinels an extraordinary vibrancy that seems to radiate from within, even in natural daylight.
Unlike many gemstones, Mahenge Spinel owes its colour entirely to nature. These remarkable gemstones are typically unheated (and untreated), allowing collectors to appreciate their vibrant beauty exactly as it formed within the earth.
Although spinel is found in several countries, the Mahenge region has produced some of the world’s finest pink spinels. Production is limited, and truly exceptional gemstones with vivid colour, excellent clarity and larger carat weights are becoming increasingly difficult to source.
As awareness of Mahenge Spinel has grown, so too has demand. Collectors, investors and luxury jewellery houses have embraced these remarkable gemstones for their rarity, natural beauty and limited supply. Today, the finest Mahenge Spinels are commanding prices that continue to climb, establishing themselves among the most desirable coloured gemstones in the market.Here at The Sapphire Merchant, Mahenge Spinel is one of our favourite pink gemstones. Its extraordinary brilliance, vivid colour and rarity make it an exceptional choice for bespoke jewellery, offering something truly distinctive for collectors seeking a gemstone that few others will own.
5. What is Cobalt Spinel?
Cobalt spinel is a rare variety of blue spinel containing trace amounts of cobalt, giving it a vivid, highly saturated blue.
Cobalt spinels exhibit an intense blue ranging from pure blue to slightly violetish blue.
Unlike many other blue gemstones, cobalt spinel is not treated to enhance its colour. The remarkable blue is entirely natural.
Cobalt spinel is valuable because of its rarity, exceptional colour, and growing demand among collectors and jewellery enthusiasts.
According to GIA, vivid cobalt blue spinels are among the most desirable spinels in the marketplace, with stones displaying excellent transparency and minimal inclusions being especially rare.
Cobalt spinels are found in Vietnam, Sri Lanka and Tanzania, with Vietnam’s Luc Yen mining district producing some of the finest examples.It is important to note that not every blue spinel contains cobalt.
Blue spinel can derive its colour from different trace elements. Iron can also produce blue colouration. Laboratory testing is required to confirm the presence of cobalt.
Ultimately, it is the beauty and saturation of the colour that determines value rather than simply whether cobalt is present.
6. Spinel vs Sapphire
Ruby and sapphire are both members of the corundum family.
Spinel is an entirely different mineral.
Sapphire has a slightly higher refractive index than spinel, giving it marginally greater brilliance. However, the difference is subtle, and spinel remains one of the brightest coloured gemstones available.
Spinel’s refractive index, combined with its exceptional clarity, produces remarkable brilliance, fire and scintillation that rivals sapphire.
Like sapphire, spinel is durable enough for everyday wear and performs exceptionally well in engagement rings and fine jewellery.
Fine gem-quality spinel is found in fewer deposits than sapphire, making exceptional stones increasingly difficult to source.
Spinel vs Ruby
Although red spinel may resemble ruby, they are completely different gemstones.
Ruby is the red variety of corundum and has the chemical composition Al₂O₃.
Spinel belongs to an entirely different mineral family with the chemical formula MgAl₂O₄.
Ruby rates 9 on the Mohs hardness scale, while spinel rates 8, making both gemstones suitable for everyday jewellery.
Ruby occurs only in shades of red.
Spinel, however, occurs naturally in red, orange, pink, purple, blue, grey, black and colourless varieties.Fine ruby commands some of the highest per-carat prices of any coloured gemstone. Historically, however, many of the world’s most famous “rubies” were later discovered to be spinels.
7. Is Spinel Suitable for an Engagement Ring?
Yes. Spinel is an excellent choice for an engagement ring and other jewellery designed to be worn every day.
When selecting a gemstone for an engagement ring, one of the most important considerations is durability. Durability refers to a gemstone's ability to withstand everyday wear, including resistance to scratching, chipping, heat and chemicals.
Spinel has a hardness of 8 on the Mohs scale, making it a durable gemstone suitable for rings, pendants, earrings and bracelets. While it is slightly softer than sapphire and ruby, which both rank 9 on the Mohs scale, spinel possesses excellent toughness and stability, allowing it to perform exceptionally well in everyday jewellery.
Like all precious gemstones, spinel should be treated with reasonable care. Although it is durable enough for daily wear, a sharp knock against a hard surface may damage any gemstone, regardless of its hardness.
It is also important to recognise that not every spinel is suitable for jewellery. Factors such as clarity, inclusions and overall crystal quality all influence a gemstone's durability.
At The Sapphire Merchant, we carefully hand-select fine-quality spinels that are suitable for custom crafted jewellery, ensuring each gemstone is chosen not only for its exceptional beauty but also for its ability to be enjoyed for generations.
For those seeking something distinctive, spinel offers an exceptional alternative to traditional engagement ring gemstones (diamonds, sapphire, rubies and emeralds). Its remarkable brilliance, extraordinary range of natural colours and excellent durability make it a beautiful choice for a ring that is designed to be worn and treasured every day.
8. Why Collectors are Paying Attention to Spinel
For centuries, spinel lived in the shadow of ruby and sapphire.
Today, it is finally receiving the recognition it deserves.
Collectors are increasingly drawn to spinel because of its remarkable natural colours, exceptional brilliance, rarity, and limited supply.
As fine sapphires and rubies become increasingly scarce and expensive, spinel has emerged as one of the most exciting gemstones in the coloured gemstone market.
From the electric glow of Mahenge pink, to the legendary fluorescence of Jedi red, and the unforgettable saturation of cobalt blue, spinel offers something truly distinctive.
Once overlooked, spinel has become one of the world’s most exciting coloured gemstones. With its extraordinary natural colours, remarkable brilliance, fascinating history and limited supply, it offers collectors the rare opportunity to own something both beautiful and genuinely uncommon. As appreciation for fine coloured gemstones continues to grow, spinel is no longer simply an alternative to ruby or sapphire, it has earned its place among the world’s most coveted precious gemstones.
It is one of the most exciting collector gemstones of our time.
8. Buy Natural Spinel Gemstones
Discover our curated collection of natural spinel gemstones, including rare cobalt blue spinel, Mahenge pink spinel, purple spinel, grey spinel and lotus spinel. Each gemstone is hand-selected for its exceptional colour, brilliance and individuality.
Shop our spinel collection to find a remarkable natural gemstone for a custom ring, pendant or one-of-a-kind jewellery piece.