Precious Opal EarringsThese lovely precious opal earring studs display nice colour. They are 6 mm rounds, which is an excellent size for a gemstone worn as a stud since they are easily noticeable but not overwhelming. The gemstones are very translucent cabochons that have flashes of orange, yellow, and green. The settings are solid sterling silver with a patina of black rhodium and 22 karat yellow gold highlights on the bezel.