Peruvian blue opal triple strand necklace with sterling silver clasp

This necklace was purchased from an estate and is in excellent pre owned condition showing little to no signs of wear.  Peruvian blue opal beads from 4-9mm on three strands. Longest strand is about 22 inches in length with a 2 inch extension. Extension chain and lobster clasp are sterling silver. 925 RB Reasonable offers considered