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

Faux Tortoise Shell Finish

Turtle shells help decode complex links between modern, fossil species – Research News

Let's Learn AboutTortoiseshell

Thomas HAINSCHWANG, Co founder, research scientist and director, PhD, Gemlab (Liechtenstein)

Tortaddiction: How to trim a tortoise's beak - with pictures!

Troublesome turtles: Invasive red-eared sliders in the Great Lakes - Michigan Sea Grant

Because of the expense of the genuine material and legal restrictions

Reeve's Turtle Care - Reptiles Magazine

Sulcata Tortoise Care Sheet – Dubia.com

Desert Tortoise - Joshua Tree National Park (U.S. National Park Service)

Natural Curiosity 2nd Edition

Sea Turtles Smithsonian Ocean

Tracking Utah's Nuclear History with a Tortoise Shell

PDF) The Characterization of Tortoise Shell and its Imitations

Sea Turtle Tracking: Active Sea Turtles – Sea Turtle Conservancy