Description Swiss Blue Cubic Zirconia Rounds These are 3A machine cut. Diamond Cut. Swiss blue cubic zirconia is a dazzling and vibrant gemstone known for its striking blue hue. Swiss blue cubic zirconia is frequently used in various types of jewelry, including rings, earrings, necklaces, and bracelets, to add a touch of elegance and sophistication to any outfit. Its affordability and brilliance make it a desirable option for those looking to enjoy the beauty of blue gemstones without breaking the bank.