1 Tortoise shell is the only turtle on the earth that can digest glass. The important food is sponge, which contains a lot of silicon dioxide, similar to the chemical composition of glass, which explains the magical translucent lines of tortoise shells. 2. The tortoise-shell spectacle frame is rich in color, black, black, brown and light golden yellow, with various colors interspersed, black spots strewn at random, and the overall color is dark, which adds dignity and stability to the wearer, regardless of gender. 3 Tortoise shell will smell of burnt hair after it is ignited. The physical structure of tortoise shell is very close to nails and hair, and it is the closest friend with blood relationship with skin, so it will not slide down easily when sweating, and it will not cause allergies. There are many reports about traditional metallic glass and plastic glass allergy. Tortoise shell glasses can solve this problem well. The tortoise shell is hard and tough, and the frame will not break when it is bent at 45 degrees. Good physical properties can keep the frame from deforming all the year round. In addition, the wonderful lines of hawksbill will never fade, and this beauty will last forever with the passage of time, so every hawksbill handicraft is a family heirloom that can be passed down from generation to generation!