- Gemstone necklace is made of turquoise chips, lobster clasp, 2 positioning beads and a chain extender. The irregular turquoises, measured in 3-6 mm * 5-12 mm diameter, are in green-blue color. They make each piece of turquoise beaded choker be beautiful and unique. The accessories on this boho necklace for ladies are 18k gold plated copper. This handmade jewelry for women is adjustable. The length of the adjustable necklace is around 15 inches ~ 17 inches.