The moon phases pendant measures 20mm x 4mm. It is available in gold or silver. It is a good choice for everyday wear. It is non corrosive and non tarnish. It is also hypoallergenic and can be worn by most people. It makes a perfect gift for yourself or a friend. The strong chain makes it a good choice for active lifestyles. It has an 18” link chain with extender that can be worn from 15”- 18”.