NEVER KNEW bangle bracelet in solid, recycled sterling silver including a fine, 6 mm Old European Cut Mpingo Blackwood Mpingo. Mpingo is most often used for clarinets and other classical wind instruments. The most gorgeous sustainable material, it creates a gentle contrast to the gold or silver. Material: Silver Stone: Mpingo Stone Colour: Black Number of Stones: 1 Stone Shape: Old European Cut Does it come with certificate? No Can the piece be engraved? No