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Tiger’s eye

Quartz after crocidolite · SiO₂ · Mohs 6.5–7

In short

Tiger’s eye belongs to the quartz after crocidolite group, SiO₂, and sits at 6.5–7 on the Mohs scale. The colour is iron oxide replacing asbestiform amphibole. The material on the market comes chiefly from Northern Cape, South Africa. Bleaching and heating produce the red and honey variants.

The facts

Species
Quartz after crocidolite
Chemistry
SiO₂
Hardness
6.5–7 on the Mohs scale
Refractive index
1.534–1.540
Specific gravity
2.64–2.71
Crystal system
Trigonal (fibrous)
Cleavage
None
Cause of colour
Iron oxide replacing asbestiform amphibole
Origins
Northern Cape, South Africa · Western Australia · India
Treatment
Bleaching and heating produce the red and honey variants. Dyed blue is sold as "hawk’s eye".
Confused with
Pietersite, Dyed quartzite, Glass
Price guidance
$1–20/ct

What tiger’s eye actually is

The species behind tiger’s eye is quartz after crocidolite, SiO₂; it forms in the trigonal (fibrous) system.

Iron oxide replacing asbestiform amphibole is responsible for the colour — and the chromophore, not the name, is what decides whether a colour is stable.

On the instruments it reads a refractive index of 1.534–1.540 and a specific gravity of about 2.64–2.71, with none cleavage.

Where tiger’s eye comes from

Commercial material comes from Northern Cape, South Africa, Western Australia and India.

Different localities give different colour and different clarity, and the trade prices them differently. We state which one.

How tiger’s eye is treated

Bleaching and heating produce the red and honey variants. Dyed blue is sold as "hawk’s eye".

We state the treatment on every stone, including when the honest answer is that it cannot be determined. A treatment disclosed is a fact; a treatment discovered later is a refund.

What tiger’s eye is confused with

Watch for Pietersite, Dyed quartzite and Glass — these are what turn up sold under this name.

The separation is rarely a matter of opinion: refractive index 1.534–1.540 and specific gravity 2.64–2.71 settle most of it in a minute, and magnification settles the rest.

What tiger’s eye is used for

The trades that buy tiger’s eye are jewellery, watch dials, decorative objects and architecture and interiors. They do not want the same thing, and they do not pay in the same unit.

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

Tiger’s eye is 6.5–7 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 tiger’s eye costs

Expect roughly $1–20/ct, depending on quality.

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 tiger’s eye treated, and how?

Bleaching and heating produce the red and honey variants. Dyed blue is sold as "hawk’s eye".

Where does tiger’s eye come from?

Northern Cape, South Africa, Western Australia and India. Origin affects price, so we name the locality rather than the country on every quote.

Is tiger’s eye hard enough to wear every day?

Yes. At 6.5–7 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 tiger’s eye cost?

Indicatively $1–20/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 tiger’s eye confused with?

Most often Pietersite, Dyed quartzite and Glass. A refractive index of 1.534–1.540 and a specific gravity near 2.64–2.71 separate it quickly.

What is tiger’s eye used for besides jewellery?

watch dials, decorative objects and architecture and interiors. Each of those trades buys it in a different form and a different unit.

Related stones

Looking for tiger’s eye?

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