This original design is my Koala pendant with Black Onyx in vermeil. Vermeil is an electrolytic plating of gold on top of sterling silver. I use 18k gold and a thickness of 100 microns to create a durable, lifetime piece of wearable art. The Koala measures 1 inch (24 mm) from top to bottom and 3/4 of an inch (18 mm) from side to side with a weight of 5.4 grams. Ready to wear with the satin cord provided. Thank you.