One more question. I read the blog post (here, on shopperlib) about composite/lead glass-filled rubies, and I’m curious whether these rubies are natural or not. What does it mean “commonly treated”? The seller states they are “commonly treated”. What is that supposed to mean? Is that another way to say they are glass-filled?
Here is the link: https://www.catawiki.com/l/33514815-18-kt-white-gold-bracelet-ruby-diamonds
Thanks!