10K Gold set Opal pendant with Diamond chips - vintage

Beautiful 1-inch x 1/2 inch pendant. There are 4 fiery solid opals, each a bit different size - about 1/4 inch long. In the center are 2 tiny diamond chips. There is a necklace loop so you can add your own chain. (Chain not included.) It is marked 4.17 10K - meaning 10K gold. 10K has 10 parts of pure gold and 14 parts of other metals which means it’s 41.7% pure It is from Australia. Vintage but like new - rarely worn. NG-079