Tortoiseshell: look-alikes and how to tell
Short answer
Tortoiseshell is commonly confused with dyed horn, celluloid and acetate.
The material for certain, and the age.
Look-alikes
- dyed horn
- celluloid and acetate
What to look at
Against the light, tortoiseshell has soft-edged mottling made of dots; plastic has sharp-edged patches and swirls.
What settles it
- Loupe against the light.
- To sell: a specialist.
Rules on selling it
If it is tortoiseshell: the hawksbill turtle is listed in CITES Appendix I: international trade is banned and domestic sale is largely limited to documented antiques.
- CITES. Eretmochelys imbricata, Appendix I. CITES, Apéndices
- UK. It can be sold without a certificate only if the piece is a "worked" specimen made before 3 March 1947; a whole or merely polished shell does not count as worked. GOV.UK, worked specimens
- US. Endangered Species Act: interstate sale is banned except for antiques over a hundred years old that meet its requirements. Endangered Species Act, 16 U.S.C. 1539(h)
This is a summary of public rules, not legal advice; they change.
Frequently asked
What can tortoiseshell be mistaken for?
dyed horn; celluloid and acetate.
How can I tell tortoiseshell from its look-alikes?
Loupe against the light. To sell: a specialist.