Meaning

• A precious stone, usually of substantial monetary value or prized for its beauty or shine.

• Any precious or highly valued thing or person.

  "She's an absolute gem."

• Anything of small size, or expressed within brief limits, which is regarded as a gem on account of its beauty or value, such as a small picture, a verse of poetry, or an epigram.

  "a gem of wit"

• A gemma or leaf-bud.

• A type of geometrid moth, Orthonama obstipata.

• A package containing programs or libraries for the Ruby programming language.

• A size of type between brilliant (4-point) and diamond (4½-point), running 222 lines to the foot.

Meaning

• To adorn with, or as if with, gems.