The facts
What sphalerite actually is
Sphalerite is classified as sphalerite, with the composition (Zn,Fe)S. It crystallises in the cubic system.
Colour comes from fe²⁺ content controls the colour from near-colourless through honey-yellow and orange-red to opaque black; dispersion 0.156 is three times diamond's, which is also what a laboratory looks at when it is asked whether a colour is natural.
Refractive index 2.369–2.430. Specific gravity around 3.90–4.10. Cleavage: perfect dodecahedral in six directions. Those three numbers separate it from most of what imitates it.
Where sphalerite comes from
Sphalerite is produced at Las Manforas Mine, Áliva, Picos de Europa, Cantabria, Spain, Chivera and Naica, Chihuahua, Mexico, Trepča, Kosovo, Dalnegorsk, Russia and Elmwood, Tennessee, USA.
The locality is part of the description, not a footnote — two stones of the same weight from two of these places are not the same stone.
How sphalerite is treated
Untreated. The Spanish Áliva material is the classic gem source for the vivid orange 'Spanish sphalerite'. Six perfect cleavages plus Mohs 3.5 make cutting a specialist job and wearing a bad idea; the reward is fire no other stone matches.
Treatment changes value, sometimes by a multiple, so it belongs in the description before the price and not after the sale.
What sphalerite is confused with
In the trade sphalerite is most often mistaken for, or substituted by, Diamond (dispersion), Sphene, Zircon, Cassiterite or Amber.
The separation is rarely a matter of opinion: refractive index 2.369–2.430 and specific gravity 3.90–4.10 settle most of it in a minute, and magnification settles the rest.
What sphalerite is used for
Demand for sphalerite comes from mineral collecting, jewellery, heavy industry and metallurgy, which is why one price per carat never covers it.
We quote each application in the unit that trade actually buys in, by the specimen, by the carat or by the tonne.
Durability and care
Hardness 3.5–4; cleavage perfect dodecahedral in six directions. That combination decides what it can safely be set into.
Below about 5.5 a stone will be scratched by ordinary household dust, which is largely quartz. That does not make it unusable — it makes it a pendant, an earring or an object rather than a ring worn every day.
Warm water, mild soap and a soft brush. Avoid ultrasonic cleaners on anything fracture-filled, stabilised, dyed or visibly included.
What sphalerite costs
As a guide, sphalerite trades around Faceted stones $40–$250/ct; fine Spanish gem crystals $200–$10,000.
That is a range, not a quote. Colour, size, clarity, cut and origin move the figure a long way inside it, and the only honest price is one given against a specific stone. Send us what you need and we will price it.
Questions
Is sphalerite treated, and how?
Untreated. The Spanish Áliva material is the classic gem source for the vivid orange 'Spanish sphalerite'. Six perfect cleavages plus Mohs 3.5 make cutting a specialist job and wearing a bad idea; the reward is fire no other stone matches.
Where does sphalerite come from?
Las Manforas Mine, Áliva, Picos de Europa, Cantabria, Spain, Chivera and Naica, Chihuahua, Mexico, Trepča, Kosovo, Dalnegorsk, Russia and Elmwood, Tennessee, USA. Origin affects price, so we name the locality rather than the country on every quote.
Is sphalerite hard enough to wear every day?
Not really. At 3.5–4 on the Mohs scale it is softer than the quartz dust in ordinary household dirt, so it scratches with wear. It suits pendants, earrings and objects better than a daily ring.
How much does sphalerite cost?
Indicatively Faceted stones $40–$250/ct; fine Spanish gem crystals $200–$10,000. Colour, size, clarity and origin move the price a long way within that, so treat it as a range and ask for a quote against a specific stone.
What is sphalerite confused with?
Most often Diamond (dispersion), Sphene, Zircon, Cassiterite and Amber. A refractive index of 2.369–2.430 and a specific gravity near 3.90–4.10 separate it quickly.
What is sphalerite used for besides jewellery?
mineral collecting, heavy industry and metallurgy. Each of those trades buys it in a different form and a different unit.
Related stones
Looking for sphalerite?
Tell us the size, the quality and what it is for. We source it, photograph it and quote it — with the locality named.
Ask about sphalerite