Tiger's Eye vs Hawk's Eye vs Bull's Eye
Compare golden tiger's eye, blue hawk's eye and red tiger's eye through colour, the moving light band and documented treatments.
In this field note
Browse every tiger’s eye piece BE. currently makes.
The blue-grey, golden-brown and red-brown appearances make these materials easy to compare side by side. Their shared feature is chatoyancy: a band of light that moves across the polished surface as the stone turns.
Blue-grey, golden-brown and red-brown describe their colours. The light band gives all three a changing appearance as the stone turns.
How are hawk's eye, tiger's eye and bull's eye related?
Tiger's eye is quartz containing aligned, fibrous amphibole-derived inclusions. These inclusions produce its moving light band. In golden-brown material, iron-rich amphibole has altered to iron oxides and hydroxides. Hawk's eye retains blue fibres with less alteration.
Blue and yellow areas can occur together. Field studies near Prieska, South Africa, document variegated material with a clear boundary between them.
| Name | Material | Appearance | Colour context |
|---|---|---|---|
| Hawk's eye | Chatoyant quartz with amphibole-derived inclusions | Blue to blue-grey | Less altered fibres retain blue colour |
| Golden tiger's eye | Chatoyant quartz with altered amphibole-derived inclusions | Yellow to golden brown | Iron oxides and hydroxides occur in the altered inclusions |
| Red tiger's eye | Red chatoyant quartz material | Red to red-brown | Heating can produce red colour; a particular piece needs its own treatment record |
The material's formation has more than one proposed explanation. A 2003 study of South African specimens proposed repeated cracking and sealing with quartz and fibres growing together; other researchers proposed alteration of pre-existing fibres. The visible colour comparison does not require choosing one model for every specimen.
What does the name bull's eye tell you?
When bull's eye is used for red tiger's eye, the material name is red tiger's eye. Heating can produce this red appearance.
Hawk's eye and falcon's eye refer to the blue material, a related variety of chatoyant quartz.
How should you compare the three colours?
Use the same light and background for all three materials. Turn each piece slowly and compare the colour that remains visible with the band that moves over its surface. Matching the viewing conditions makes differences in tone, pattern and reflection easier to see.
| Material name | What to observe | What to read separately |
|---|---|---|
| Hawk's eye | Blue-grey tone, any yellow areas and the moving reflection | Material identity and treatment information |
| Golden tiger's eye | Golden-brown tone, pattern and the definition of the light band | Material identity and treatment information |
| Red tiger's eye | Red-brown tone, pattern and the moving reflection | Whether heating or another treatment is recorded |
Bleaching and dyeing are documented treatments for tiger's eye. Fibre-optic glass is also a documented imitation with a moving light band. Colour and the moving reflection alone cannot establish material identity or treatment; the material record supplies that information for the piece.
What can you observe on a polished strand?
- Compare several beads in one light. Look at their colour depth and how the tones sit together across the strand.
- Look at the pattern. Blue and yellow areas may meet at a clear boundary.
- Compare the polished surfaces. Follow their reflections as the beads turn, keeping the position of the light steady.
- Read the material record alongside those observations. The record names the material and gives its documented treatment.
The tiger's eye guide explains the material and its optical structure. For routine wear, follow the Care & Durability Checker. Leave drilling, grinding and refinishing to equipped professionals.
How does BE. record the material?
BE. uses BE. Crystal 4T™ to assess Transparency, Tone, Texture and Treasure. The Stone Origin Record gives material and treatment information for the recorded lot. Read those details alongside the colour and reflections visible in the finished piece.
Frequently asked questions
Q1. Are tiger's eye and hawk's eye the same stone?
They are related chatoyant quartz materials. Hawk's eye retains blue fibres with less alteration; golden tiger's eye has amphibole-derived inclusions altered to iron oxides and hydroxides.
Q2. What is bull's eye stone?
When the name is used for red tiger's eye, it refers to red chatoyant quartz. Heating can produce this colour.
Q3. Is red tiger's eye natural?
Heating can turn tiger's eye red. Heat-treated tiger's eye retains its quartz material identity, with heating recorded as its treatment.
Q4. Is blue tiger's eye dyed?
Natural blue hawk's eye exists. Bleaching and dyeing are also documented treatments for tiger's eye.
Q5. Does hawk's eye contain asbestos?
Hawk's eye is described as quartz with amphibole-derived fibrous inclusions. Crocidolite is an asbestos mineral, but residual fibres depend on the specimen. Material identity alone does not establish exposure during wear; finished jewellery and cutting dust are different situations.
Q6. How should I compare a golden, blue and red strand?
Compare colour depth, the definition of the moving light bands, polish and the relationship between neighbouring beads.
References
Field Notes.
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