The elegant Rainbow ear stud is made in 10-karat gold and is set with a facet-cut blue Sapphire gemstone. The ear stud belongs to the Rainbow collection, creating colourful combinations of Tourmalines, baroque pearls, and Diamonds. The Sapphire is the birthstone of September and comes in various colours. The Sapphire symbolises loyalty, love, wisdom, and peace of mind. This makes Sapphire a great gift for someone you care about as a symbol of your love. Material: Gold Karat: 10K Stone: Sapphire Number of Stones: 1 Stone Setting: 4 Prong Dimensions: Stone: 2 mm Sold as: Single Does it come with certificate?Yes Can the piece be engraved? No