This pendant contains a blue opal from the Lightning Ridge mines in New South Wales. The stone is domed and is 9mm long and 7mm wide. It has a blue background and displays flashes of lighter blue. The entire pendant is 2.4cm long and 1.6cm wide at its widest point. The round part is made of a Victorian 3 pence piece, which I smoothed down and integrated into the metalwork. The back is hallmarked for Edinburgh 2018.