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Tiffany Stone

Beryllium-bearing opalised fluorite breccia · CaF₂ with SiO₂·nH₂O, Be₄Si₂O₇(OH)₂, chalcedony and dolomite · Mohs 4–6

Also sold as: Bertrandite, opalised fluorite, 'purple passion', ice cream opalite

In short

Tiffany Stone is a beryllium-bearing opalised fluorite breccia, CaF₂ with SiO₂·nH₂O, Be₄Si₂O₇(OH)₂, chalcedony and dolomite, and sits at 4–6 on the Mohs scale. The colour is governed by purple and lavender from fluorite colour centres; white from opal and chalcedony; black from manganese oxides. Most of what is traded comes out of Brush Wellman beryllium mine, Spor Mountain, Juab County, Utah, USA. Untreated, but the deposit is a working beryllium mine with no public access, so supply is by-product and finite.

The facts

Species
Beryllium-bearing opalised fluorite breccia
Chemistry
CaF₂ with SiO₂·nH₂O, Be₄Si₂O₇(OH)₂, chalcedony and dolomite
Hardness
4–6 on the Mohs scale
Refractive index
1.43–1.54 (variable, spot)
Specific gravity
2.4–2.8
Crystal system
Aggregate
Cleavage
Fluorite octahedral cleavage in patches
Cause of colour
Purple and lavender from fluorite colour centres; white from opal and chalcedony; black from manganese oxides
Origins
Brush Wellman beryllium mine, Spor Mountain, Juab County, Utah, USA
Treatment
Untreated, but the deposit is a working beryllium mine with no public access, so supply is by-product and finite. Softer patches are sometimes resin-stabilised. Beryllium dust is toxic — cut and grind wet.
Confused with
Charoite, Lepidolite, Fluorite, Sugilite
Price guidance
Rough 40–200 USD/kg; cabochons 25–150 USD

What tiffany Stone actually is

Tiffany Stone is classified as beryllium-bearing opalised fluorite breccia, with the composition CaF₂ with SiO₂·nH₂O, Be₄Si₂O₇(OH)₂, chalcedony and dolomite. It crystallises in the aggregate system.

Colour comes from purple and lavender from fluorite colour centres; white from opal and chalcedony; black from manganese oxides, which is also what a laboratory looks at when it is asked whether a colour is natural.

Refractive index 1.43–1.54 (variable, spot). Specific gravity around 2.4–2.8. Cleavage: fluorite octahedral cleavage in patches. Those three numbers separate it from most of what imitates it.

Where tiffany Stone comes from

Tiffany Stone is produced at Brush Wellman beryllium mine, Spor Mountain, Juab County, Utah, USA.

One source only — which is unusual, and which means an origin claim naming anywhere else is either a mistake or a different material.

How tiffany Stone is treated

Untreated, but the deposit is a working beryllium mine with no public access, so supply is by-product and finite. Softer patches are sometimes resin-stabilised. Beryllium dust is toxic — cut and grind wet.

Treatment changes value, sometimes by a multiple, so it belongs in the description before the price and not after the sale.

What tiffany Stone is confused with

In the trade tiffany Stone is most often mistaken for, or substituted by, Charoite, Lepidolite, Fluorite or Sugilite.

The separation is rarely a matter of opinion: refractive index 1.43–1.54 (variable, spot) and specific gravity 2.4–2.8 settle most of it in a minute, and magnification settles the rest.

What tiffany Stone is used for

Demand for tiffany Stone comes from jewellery, carving and sculpture, decorative objects 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, by the block or by the piece.

Durability and care

Hardness 4–6; cleavage fluorite octahedral cleavage in patches. 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 tiffany Stone costs

As a guide, tiffany Stone trades around Rough 40–200 USD/kg; cabochons 25–150 USD.

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 tiffany Stone treated, and how?

Untreated, but the deposit is a working beryllium mine with no public access, so supply is by-product and finite. Softer patches are sometimes resin-stabilised. Beryllium dust is toxic — cut and grind wet.

Where does tiffany Stone come from?

Brush Wellman beryllium mine, Spor Mountain, Juab County, Utah, USA. That is the only commercial source.

Is tiffany Stone hard enough to wear every day?

Not really. At 4–6 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 tiffany Stone cost?

Indicatively Rough 40–200 USD/kg; cabochons 25–150 USD. 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 tiffany Stone confused with?

Most often Charoite, Lepidolite, Fluorite and Sugilite. A refractive index of 1.43–1.54 (variable, spot) and a specific gravity near 2.4–2.8 separate it quickly.

What is tiffany Stone used for besides jewellery?

carving and sculpture, decorative objects and mineral collecting. Each of those trades buys it in a different form and a different unit.

Related stones

Looking for tiffany stone?

Tell us the size, the quality and what it is for. We source it, photograph it and quote it — with the locality named.