Mix, match, and stack: these bar studs bring endless possibilities to your style. Material: Gold Karat: 18K Stone: Diamond Stone Colour: White Number of Stones: single: 4, pair: 8 Stone Carat: single: 05,5cts. Pair: 0.11cts Stone Type: VS SI Stone Shape: Round Does it come with certificate? No Can the piece be engraved? No Sold as single or pair