This is a relatively chunky pendant, which is set with a so-called black opal from Lightning Ridge, Australia. The opal is actually blue and has a grey background with blue and green flashes. The stone is quite large, 1.8cm long and 1.5cm wide. The entire pendant is 3.6cm long and 0.5cm deep. It weighs 5.36 grams. The back of the hanger is hallmarked for Edinburgh 2016. The pendant comes with an 18″ (45cm) long Sterling silver snake chain and will be sent gift boxed.