Setting:

The system by which a stone is held in a piece of jewelry; it can be claw, bezel, or invisible. Each type modifies how light enters the gem.

Choker:

A short necklace worn close to the neck. In different eras, it has symbolized everything from aristocratic elegance to youthful rebellion.

Gemology:

The discipline that studies gemstones from a scientific perspective, including their origin, composition, and authenticity.