One of the four precious stones, rubies range from pink to deep red in color. They are mined in Southeast Asia and parts of Africa. Most natural rubies have inclusions or color imperfections.

Rhodium is a brilliant silver-white metal, usually the most valuable of the precious metals. Its properties are similar to platinum, and it is used in jewelry making because of its shine and resistance to tarnish. When electroplated or "flashed" over a base metal like silver or white gold, rhodium takes on a shining silver-white appearance similar to platinum.

Citrine is quartz generally occurring in a golden color. Citrine occurs naturally in Scotland and in the Ural Mountains of Russia. Much citrine available today is actually smoky quartz or amethyst that has been heat-treated to achieve its characteristic color.