Named for its resemblance to a lobster claw, this clasp has a hook with a spring-powered arm that can be opened and closed. The hook is attached to the opposite end of the chain, and the arm is closed to secure the chain.

The actual colour of an object or surface, unaffected by shadow colouring, light quality or other factors.

Canvas that has not been primed, sized or otherwise prepared beforehand for painting.

A magnification tool used by jewelers to analyze gemstones and other jewelry materials. Diamonds and color stones are always evaluated at 10x magnification and in the face-up position.