The elegant Rainbow ear stud is made in 10-karat gold and is set with a brilliant-cut Black Diamond gemstone. The ear stud belongs to the Rainbow collection, creating colourful combinations of Tourmalines, baroque pearls, and Diamonds. The Diamond is April's birthstone, symbolising love, strength, and invincibility. Material: Gold Karat: 10K Stone: Black Diamond Number of Stones: 1 Stone Carat: 0,03 Stone Setting: 4 Prong Dimensions: Stone: 2 mm Sold as: Single Does it come with certificate?Yes Can the piece be engraved? No