Gemmology Writer
Priya writes the House's technical guides — how spinel forms, how to tell it apart from ruby, sapphire and its many look-alikes, and why it is so rarely treated. Her articles draw on published gemmological references and the reporting standards of laboratories such as GIA, GRS and Gübelin.
Spinel or a lab-grown diamond for your ring? One is a rare natural coloured gem, the other a manufactured colourless brilliant. We compare durability, look, price, ethics and resale so you can choose well.
Spinel is a rare natural gem; cubic zirconia is a synthetic diamond simulant. Learn the density, fire and value tests that separate them in seconds, and why CZ is not zircon.
What a spinel doublet actually is, why composite and assembled stones exist, the tell-tale signs that expose them at home, and how a gem lab confirms your spinel is one solid, natural crystal.
Spinel and morganite both wear soft pink, but they are different minerals: spinel is denser, harder and untreated, while morganite is lighter beryl that is frequently heat-treated. Here is how to choose.
Spinel-law twinning explained: how the flattened triangular macle forms across a shared {111} plane, how to recognise it in rough, and why the classic twin law, also seen in diamond, takes its name from spinel.
Glass has imitated coloured gems for centuries, but it never fools a loupe. Learn how gas bubbles, swirl marks, softness and warmth expose paste, and how crystalline spinel gives itself away as the real thing.
Spinel is rarer than the ruby it was long mistaken for, almost never treated, and Mohs 8 hard — yet it stays underrated. Here is exactly why, and why that is finally changing.
Spinel cut en cabochon: star stones showing asterism, opaque black material, and richly included rough. How cabochons are cut, oriented and judged, who they suit, and what natural spinel cabochons are worth in 2026.
Pink and lilac spinel versus kunzite compared: hardness, cleavage, colour permanence, treatment and price. Why spinel outlasts fade-prone kunzite for everyday wear, and when each gem makes sense.
Gahnite and gahnospinel are the zinc-bearing members of the spinel group: denser, higher in refractive index and usually dark blue to near-black. A gemmologist's guide to identifying, valuing and collecting these rare zinc spinels.
Everything you need to know about natural spinel in 2026: what it is, the colours and their causes, how rarely it is treated, real price ranges, famous origins, and how to buy with confidence.
Is spinel valuable? Increasingly so. This 2026 collector's guide breaks down what drives spinel value - colour, size, clarity, origin and certification - with honest, current per-carat price ranges from a specialist loose-spinel dealer.
Spinel vs sapphire, from specialist dealers: how cobalt-blue spinel compares to blue sapphire on treatment, price, brilliance and rarity as of 2026.
Wondering how to tell real spinel from glass, synthetics or a mislabelled ruby? Here are six practical tests, from a loupe check to an independent laboratory certificate.
Spinel vs diamond compared on hardness, brilliance, colour, price and ethics, so you know exactly when a natural coloured spinel beats a colourless diamond and when it does not.
Flame-fusion synthetic spinel has filled costume jewellery for over a century. Here is how gemologists separate it from natural spinel — and why an independent lab report is always the final word.
Red spinel and red garnet look near-identical, yet they separate easily. Learn how density, refractive index, spectrum and fluorescence tell fine chromium-red spinel from almandine, pyrope and rhodolite garnet, and which is more valuable.
Spinel versus rubellite tourmaline compared: species, single versus double refraction, pleochroism, hardness, treatment and 2026 value, with a clear step-by-step guide to telling these two red-to-pink gems apart.
Natural spinel is almost never treated or heated — unlike roughly ninety percent of blue sapphire. Here is the honest dealer's answer on spinel treatment, the rare exceptions, how labs detect them, and why untreated matters for value.
Spinel hardness is 8 on the Mohs scale, with good toughness and no cleavage. Here is what that means for durability, everyday rings, and how spinel compares to ruby and sapphire.
A candid, gemologist-informed look at spinel healing properties as tradition, not fact: colour meanings, chakra associations, and how people use spinel in ritual, with a clear medical disclaimer throughout.
One of the rarest phenomena in the spinel world: a colour change spinel that reads blue-violet by day and purple-red by lamplight. Here is how the effect works, why it is so scarce, and how to judge the strength of the change before you buy.
What is the rarest spinel colour? True cobalt-blue leads, with Mahenge's neon pink close behind and vivid red just below. Here is the 2026 rarity ranking, why each hue is so scarce, real price ranges, and how to buy with confidence.
Spinel became an official August birthstone in 2016, joining peridot and traditional sardonyx. A full guide to spinel's colours, meaning, gifting, and why an untreated one-of-one stone appeals.
Spinel is a natural coloured gem; moissanite is a lab-made near-colourless diamond simulant. We compare brilliance, fire, durability, price and ethics to help you choose the right stone for a ring.
Where is spinel found? A dealer's tour of the global sources, from Mogok and Mahenge to Luc Yen, Ceylon and the ancient Kuh-i-Lal, with 2026 colour context.
Is spinel precious? By the old classification it is semi-precious, but that Victorian split is outdated. Fine spinel rivals ruby, sapphire and emerald in rarity, beauty and price.
Pink and red spinel are the same chromium-coloured gem on one continuous spectrum. We explain where pink ends and red begins, why the name changes the price, and how to judge a stone yourself.
Star spinel shows a rare four- or six-rayed star from oriented needle inclusions, cut as cabochons in grey, black or blue. How the star forms, how to judge quality, value and care.
Spinel and peridot are August's two birthstones, but they differ sharply: spinel is harder, singly refractive and available in every colour, while peridot is a softer, doubly refractive yellow-green. Here is how to choose.
Chromium-bearing red and pink spinel glows red under UV light, a useful clue for spotting natural spinel and separating it from look-alikes. Here is how the fluorescence test works, and where it stops.
How does spinel form? Mainly in metamorphosed impure limestone and marble, where magnesium and aluminium crystallise into octahedra, plus some igneous rock, then wash into alluvial gem gravels.
Purple spinel and amethyst can look alike in a case, yet they differ sharply on hardness, density, rarity and value. Here is how a gemologist tells the two purple gems apart.
Blue-violet spinel and tanzanite look alike in a case but differ sharply in hardness, treatment and optics. A dealer's guide to telling them apart and choosing the right blue-violet gem.
Spinel is rare for four independent reasons: minor global production, restricted trace-element geology, small crystals, and virtually no treatment. Here is the honest 2026 answer, factor by factor.
Spinel and zircon are different natural minerals, and neither is cubic zirconia. Learn the fast tests dealers use, why spinel is harder, lighter and untreated, and which is more valuable.
Spinel and topaz share Mohs 8 and look alike in blue and pink, yet differ in cleavage, refraction, treatment and value. A gemologist compares the two and shows which to buy.
A dealer's guide to what lives inside natural spinel: octahedral crystals, fingerprints, healed fissures and needles, why Type II clarity is normal, and how inclusions confirm a stone is genuine.
Spinel and tourmaline compared across colours, hardness, treatment and 2026 value: spinel is harder, singly refractive and untreated, while tourmaline offers unrivalled colour range.
Colour-change spinel and alexandrite both shift hue with light, but they are different minerals. Compare their chemistry, optics, durability and price to decide which rare gem suits you.
Spinel reads a single refractive index of about 1.712 to 1.762, specific gravity near 3.60 and a hardness of Mohs 8. Learn how these optical and physical constants confirm spinel and separate it from its look-alikes.
Bicolour spinel shows two colours in one natural crystal — pink to purple, grey to blue. Discover why it forms, how it is cut, and what makes this rare two-tone gem so collectible.
Natural spinel crystallises as octahedra and spinel-law twins, recovered from alluvial gem gravels. A guide to collecting crystals, buying faceting rough, and how cutters read a stone.
They shared a name for a thousand years. Here is how the two great red gems actually differ — and why it matters.