This beautiful, flashy Australian boulder opal, ethically sourced and cut from a woman-owned and operated mine, is set in 22k gold with 22k pebble accents. Sterling silver backing for a little contrast and cost savings on the part that doesn't really show much, since gold is so very precious these days. 18k ring and bail at the top. This price is for the necklace on an oxidized silver chain, 18 inches unless otherwise discussed. If you'd prefer it on one of the 18-in, 18K chains shown in the other photos, that can be purchased separately on request for $175.