I purchased this over 10 years ago at a jewelry exhibition in Shinsaibashi. At the time, I was told it was a "pigeon blood" ruby. However, I was informed that the certificate of authenticity and resizing would be sent to my home later, so I received it as is. The ruby is 0.52ct and the diamonds are 0.45ct. The size is 10. I've only worn it out once or twice.