This is a beautiful strand of bright purple “gel” sugilite beads complemented by solid 18k gold beads and clasp. Sugilite is a relatively new gemstone that is found only in South Africa and is no longer commercially available. The rondelle beads in this strand range from approx. 9 mm down to 4.0 mm. Wire protectors, and crimps, which are subject to wear/stress, are made with gold filled components for greater durability.
Learn more about Sugilite at this link.