The facts
What euclase actually is
Euclase is classified as euclase, with the composition BeAlSiO₄(OH). It crystallises in the monoclinic system.
Colour comes from iron and chromium, which is also what a laboratory looks at when it is asked whether a colour is natural.
Refractive index 1.652–1.672. Specific gravity around 3.05–3.10. Cleavage: perfect, one direction — the name means "easily broken". Those three numbers separate it from most of what imitates it.
Where euclase comes from
Euclase is produced at Minas Gerais, Brazil, Colombia, Zimbabwe and Tanzania.
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.
Is euclase treated?
None.
Nothing needs disclosing, and nothing about the stone can change after you buy it. If a price looks impossible, the risk is substitution rather than treatment.
What euclase is confused with
In the trade euclase is most often mistaken for, or substituted by, Aquamarine, Topaz or Sapphire.
The separation is rarely a matter of opinion: refractive index 1.652–1.672 and specific gravity 3.05–3.10 settle most of it in a minute, and magnification settles the rest.
What euclase is used for
Demand for euclase comes from mineral collecting, 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.
Durability and care
Euclase is 7.5 on the Mohs scale, with perfect, one direction — the name means "easily broken" cleavage.
Hardness is not the whole story. Perfect cleavage means the stone can split cleanly if struck along the wrong plane, whatever its Mohs number, so a protective setting matters more here than the hardness suggests.
Warm water, mild soap and a soft brush. Avoid ultrasonic cleaners on anything fracture-filled, stabilised, dyed or visibly included.
What euclase costs
As a guide, euclase trades around $200–4,000/ct.
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 euclase treated?
None.
Where does euclase come from?
Minas Gerais, Brazil, Colombia, Zimbabwe and Tanzania. Origin affects price, so we name the locality rather than the country on every quote.
Is euclase hard enough to wear every day?
With care. It is 7.5 on the Mohs scale, which is hard enough, but perfect, one direction — the name means "easily broken" cleavage means it can split if struck at the wrong angle. Use a protective setting and avoid ultrasonic cleaning.
How much does euclase cost?
Indicatively $200–4,000/ct. 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 euclase confused with?
Most often Aquamarine, Topaz and Sapphire. A refractive index of 1.652–1.672 and a specific gravity near 3.05–3.10 separate it quickly.
Related stones
Looking for euclase?
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 euclase