gem (Noun) — A precious or semiprecious stone incorporated into a piece of jewellery.
gem (Noun) — Art highly prized for its beauty or perfection.
gem (Noun) — A crystalline rock that can be cut and polished for jewellery. ex. "he had the gem set in a ring for his wife"
gem (Noun) — A brilliant or much-loved person who is highly valued.
gem (Noun) — A sweet quick bread baked in a cup-shaped pan.
gem (Noun) — A small but valuable piece of information or advice. ex. "gems of wisdom"