This is a ring by KAORU. The stone is Dumortierite in Quartz. The material is K10, and the size is a size 12 on a ring sizer. The stone on this ring is very large and has a strong presence. For reference, I have included photos with a measuring tape in the 7th and 8th images, so please use them as a general guide. Also, the arm of the ring is unique to KAORU, and the back of the stone is very detailed and beautiful. I love this ring very much, but after I bought it, my finger size changed, and I can no longer wear it on the finger I wanted to... I only tried it on indoors, and it has been kept in a jewelry box ever since. However, please understand that it has been stored for a certain period of time. As this is a very expensive item, it will be shipped via anonymous delivery using the Rakuraku Mercari service, Takkyubin (home delivery). This item has been in someone's possession once, so please refrain from purchasing if you are a nervous person or if you are looking for a perfect item. The accessories were lost during a move, but I will put it in another box and carefully package it for shipping.