Here’s the answer to our Guess the Gemstone! The gemstone is in fact Ruby but it is Glass Filled. Glass Filled Ruby is where they take a lower quality Ruby, put it in a vacuum and suck red glass into the fractures. It is a treatment that needs to be disclosed to a customer as it may come out over time and this process enhances the colour of the Ruby, so make sure you’re using a reputable gemstone supplier so as not to get caught out with this treatment. Comment with and questions and follow us f