Olivine green cube necklace on gunmetal chain, acrylic faceted, tiered graduated

This is a beautiful two tiered layered graduated green olivine faceted cube necklace on gunmetal chains. The cubes are translucent acrylic and green in front with a few very pale green almost clear cubes on the sides. She measures 18.5” inches long on the shortest layer plus a 3” inch extender. Has a lobster claw clasp. Unsigned. Very good pre owned condition with light wear from use.