Band one-of-a-kind boulder opal necklace (No. 3994)Description 10k yellow gold one of a kind boulder opal necklace, set in Januka's proprietary band setting. This opal has a natural pattern that looks a magic river flowing through stone mountains. This necklace has a silicon adjuster at the back which allows you to shorten it to the length you desire to fit your look of the day. Band collection from Januka uses their proprietary setting method which tactfully carves each stone, so the gold sinks