![18 K Gold bracelet with Rubies on Catawiki auction. Are these natural or composite rubies?](https://www.shopperlib.com/wp-content/uploads/2020/01/ruby-bracelet-260x185.jpg)
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 ...