Shop opal earrings. Looking for opal jewelry? Opal is October birthstone. It will make a great birthday gift for wife. Blue opal earrings will bring a perfect touch of flair and splash of magnificent color to your outfit! Arrays of different colors are captured in beautiful opal cabochons. They look very mysterious. Lever back earrings are very light and comfortable. It will make a great gift. I made these pacific blue opal earrings with: - Round multicolor lab created opal cabochon(8mm) - Sterling silver lever backs with a bezel. Earrings are 18mm (0.71") long. Your order of opal jewelry will be mailed within 2 business days via USPS nicely packaged ready to be given. All US orders will have a tracking#.