Black Spinel Jewellery Guide - The Affordable Alternative to Black Diamond
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Black spinel has quietly become one of the most requested stones in our drops - and it’s easy to see why once you know what you’re looking at. Deep, glossy, and genuinely brilliant, it does something most black gemstones can’t: it actually sparkles.
What Is Spinel?
Spinel is its own gemstone family, not a variety of something else - a magnesium aluminium oxide mineral that occurs naturally in a surprising range of colours, including vivid red, pink, blue, purple, and the deep black we’re focusing on here. For centuries, red spinel was mistaken for ruby - some of the most famous “rubies” in royal jewellery collections, including stones in historic crown jewels, have since been identified as spinel instead.
Black spinel specifically gets its jet-black colour from iron and other trace elements within the crystal structure. Unlike some black gemstones, which can look flat or matte, black spinel keeps a glassy, reflective surface - which is exactly why it draws comparisons to black diamond.
Black Spinel vs Black Diamond: What’s the Real Difference?
If you’ve been drawn to the look of black diamond jewellery but not the price tag, black spinel is worth knowing about specifically because of how similar the two can look:
• Both are genuinely brilliant. Black spinel has a high refractive index, meaning it reflects light in a way that reads as real sparkle, not just a flat black surface.
• Diamond is harder - it sits at 10 on the Mohs scale versus spinel’s 8 - but spinel’s hardness is still high enough for everyday jewellery, well above stones like amethyst or garnet.
• Spinel is significantly more affordable, which is the main reason it’s become the go-to substitute for anyone who wants the look without the black diamond price.
• Spinel is naturally black in this variety - it isn’t dyed or treated to achieve the colour, which matters if authenticity is important to you.
Is Black Spinel Durable Enough for Everyday Wear?
Yes. At 8 on the Mohs hardness scale, black spinel is one of the hardest coloured gemstones commonly used in jewellery - harder than amethyst, garnet, or quartz, and a practical choice for rings and bracelets that see daily wear. It’s also chemically stable, meaning it resists fading or discolouring from normal exposure to light and everyday chemicals far better than many other coloured stones.
Caring for Your Black Spinel Jewellery
Black spinel is one of the lower-maintenance stones in our collection, but a few habits will keep it looking its best:
1. Clean with a soft cloth and warm, soapy water. This is all that’s usually needed to keep the surface glossy.
2. Avoid boiling water as a cleaning method - it’s not recommended even for a stone this durable.
3. Store it away from softer gemstones in your jewellery box, since spinel’s hardness means it can scratch stones like amethyst or opal if they’re kept together.
4. Remove it before anything with a real risk of impact - even hard, durable stones benefit from avoiding direct knocks.
Not Just Black - The Wider Spinel Family
If black spinel catches your eye, it’s worth knowing the same mineral occurs in a much wider colour range - vivid reds, soft pinks, and blues all belong to the same family. Spinel has even been recognised as an alternative August birthstone in recent years, alongside peridot. If you like the idea of a stone with real history and genuine rarity compared to more common alternatives, it’s worth exploring beyond black.
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