A wide variety of materials have been used to imitate tortoise shell

Tortoise shell problems - ExoticDirect

Soft-robotic green sea turtle (Chelonia mydas) developed to replace animal experimentation provides new insight into their propulsive strategies

A Guide to Caring for Common Box Turtles as Pets

Sea Turtles Of The World

What is Tortoise Shell Pattern? Browse Glasses

How to: SpecialistFinishes - Tortoiseshell - Painting and Decorating News : Painting and Decorating News

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Lessons from nature: 3D printed bio-inspired porous structures for impact energy absorption – A review - ScienceDirect

Because of the expense of the genuine material and legal restrictions

Tortoise shell: the real thing and its imitations – Looking through art