The facts
What imperial topaz actually is
Imperial topaz is classified as topaz, with the composition Al₂SiO₄(F,OH)₂. It crystallises in the orthorhombic system.
Colour comes from chromium, which is also what a laboratory looks at when it is asked whether a colour is natural.
Refractive index 1.629–1.637. Specific gravity around 3.50–3.54. Cleavage: perfect, one direction. Those three numbers separate it from most of what imitates it.
Where imperial topaz comes from
Imperial topaz is produced at Ouro Preto, Minas Gerais, Brazil — the classic and dominant source.
That is the whole list. A single source makes supply fragile and makes any claim of a second origin worth questioning.
How imperial topaz is treated
Some heating to push toward pink. The trade name has no agreed boundary.
Treatment changes value, sometimes by a multiple, so it belongs in the description before the price and not after the sale.
What imperial topaz is confused with
In the trade imperial topaz is most often mistaken for, or substituted by, Citrine, Spessartite or Padparadscha.
The separation is rarely a matter of opinion: refractive index 1.629–1.637 and specific gravity 3.50–3.54 settle most of it in a minute, and magnification settles the rest.
What imperial topaz is used for
Demand for imperial topaz comes from jewellery and 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 carat or by the specimen.
Durability and care
Imperial topaz is 8 on the Mohs scale, with perfect, one direction 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 imperial topaz costs
As a guide, imperial topaz trades around $200–2,500/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 imperial topaz treated, and how?
Some heating to push toward pink. The trade name has no agreed boundary.
Where does imperial topaz come from?
Ouro Preto, Minas Gerais, Brazil — the classic and dominant source. That is the only commercial source.
Is imperial topaz hard enough to wear every day?
With care. It is 8 on the Mohs scale, which is hard enough, but perfect, one direction cleavage means it can split if struck at the wrong angle. Use a protective setting and avoid ultrasonic cleaning.
How much does imperial topaz cost?
Indicatively $200–2,500/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 imperial topaz confused with?
Most often Citrine, Spessartite and Padparadscha. A refractive index of 1.629–1.637 and a specific gravity near 3.50–3.54 separate it quickly.
Related stones
Looking for imperial topaz?
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 imperial topaz