A rainbow white synthetic ring is a vibrant and colorful piece of jewelry featuring a synthetic gemstone that displays a spectrum of colors against a white or clear background. These rings are often made with materials like cubic zirconia, lab-created opals, or other synthetic stones that have been engineered to reflect a rainbow of colors, giving the ring a striking and unique appearance. The "rainbow" effect is typically achieved through special cuts, coatings, or internal structures that refract light in various hues.