The elegant Rainbow ear stud is made in 10-karat gold and is set with a facet-cut red Ruby gemstone. The ear stud belongs to the Rainbow collection, creating colourful combinations of Tourmalines, baroque pearls, and Diamonds. The Ruby is the birthstone of July and is recognised for its deep red colour. Ruby symbolises vitality, confidence, power, devotion, and passion. Some also say that the ruby has a positive influence on your dreams and can remove negative energies. Material: Gold Karat: 10K Stone: Ruby 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