The semi precious circle is on an 18 inch chain with a 3 inch extender. The circle measures 22 MM in diameter and is made up of 16 half carat Marquis cut semi precious stones which include: Amethyst, Topaz, Blue Topaz, Garnet and Peridot for a total of 8 carats. Necklace is 14KT gold plated and gift boxed.