The facts
What verneuil Synthetic Corundum actually is
Verneuil Synthetic Corundum is classified as synthetic corundum, with the composition Al₂O₃. It crystallises in the trigonal system.
Colour comes from cr³⁺ for red, Fe and Ti for blue, V for the colour-change 'synthetic alexandrite' simulant, which is also what a laboratory looks at when it is asked whether a colour is natural.
Refractive index 1.762–1.770. Specific gravity around 3.98–4.00. Cleavage: none. Those three numbers separate it from most of what imitates it.
Where verneuil Synthetic Corundum comes from
Verneuil Synthetic Corundum is produced at Flame-fusion grown; historically Paris, France and Bitterfeld, Germany, now largely China and Russia.
That is the whole list. A single source makes supply fragile and makes any claim of a second origin worth questioning.
How verneuil Synthetic Corundum is treated
Manufactured since 1902 and must always be disclosed. Curved growth striae and spherical gas bubbles identify it under magnification, in contrast to the angular inclusions of natural corundum. The so-called Geneva ruby of the 1880s was an earlier fused-fragment product. Synthetic star corundum with an over-perfect star is also common.
Treatment changes value, sometimes by a multiple, so it belongs in the description before the price and not after the sale.
What verneuil Synthetic Corundum is confused with
In the trade verneuil Synthetic Corundum is most often mistaken for, or substituted by, Natural ruby, Natural sapphire, Spinel or Garnet.
The separation is rarely a matter of opinion: refractive index 1.762–1.770 and specific gravity 3.98–4.00 settle most of it in a minute, and magnification settles the rest.
What verneuil Synthetic Corundum is used for
Demand for verneuil Synthetic Corundum comes from jewellery, watch dials, technical and precision components and abrasives, 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, by the disc or by the piece.
Durability and care
Verneuil Synthetic Corundum is 9 on the Mohs scale, with none cleavage.
With no cleavage plane to worry about, the practical limit is abrasion rather than breakage, and it takes daily wear well.
Warm water, mild soap and a soft brush. Avoid ultrasonic cleaners on anything fracture-filled, stabilised, dyed or visibly included.
What verneuil Synthetic Corundum costs
As a guide, verneuil Synthetic Corundum trades around Under 1 USD/ct as rough boules; a few USD/ct cut.
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 verneuil Synthetic Corundum treated, and how?
Manufactured since 1902 and must always be disclosed. Curved growth striae and spherical gas bubbles identify it under magnification, in contrast to the angular inclusions of natural corundum. The so-called Geneva ruby of the 1880s was an earlier fused-fragment product. Synthetic star corundum with an over-perfect star is also common.
Where does verneuil Synthetic Corundum come from?
Flame-fusion grown; historically Paris, France and Bitterfeld, Germany, now largely China and Russia. That is the only commercial source.
Is verneuil Synthetic Corundum hard enough to wear every day?
Yes. At 9 on the Mohs scale with no cleavage plane, it handles daily wear well. The practical limit is gradual abrasion rather than chipping.
How much does verneuil Synthetic Corundum cost?
Indicatively Under 1 USD/ct as rough boules; a few USD/ct cut. 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 verneuil Synthetic Corundum confused with?
Most often Natural ruby, Natural sapphire, Spinel and Garnet. A refractive index of 1.762–1.770 and a specific gravity near 3.98–4.00 separate it quickly.
What is verneuil Synthetic Corundum used for besides jewellery?
watch dials, technical and precision components and abrasives. Each of those trades buys it in a different form and a different unit.
Related stones
Looking for verneuil synthetic corundum?
Tell us the size, the quality and what it is for. We source it, photograph it and quote it — with the locality named.
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