Size... Finger circumference is inner diameter x 3.14 Size 18 (inner diameter 1.89 cm) Cubic Zirconia Rhodium plating What is a triplet opal? It is an opal made by attaching thin pieces of white opal to a base and covering them with a dome-shaped crystal to protect them and reflect the colors, making them appear even more beautiful. If items are shipped together, we will discount 100 yen from the second item onwards. Items under 500 yen will be discounted by 50 yen. Material... Other metal Decoration... Zirconia