I bought a large ruby ring in 9 carat gold, early this year, I didn’t realise that the ruby had been glass filled, as it didn’t state this on the receipt or on the tv advert when I bought it, I have since contacted TJC and apparently it states on their terms and conditions that they can use a variety of processes! . I would still expect it to say what treatment had been done to my ring on the certificate. As I would have returned it. As it is too large for me I have tried to sell it, and was told by the buyer it was glass filled which I didn’t know. I paid £300 for this ring and can’t sell it for £100 , please don’t buy from them as they aren’t interested. It was over the 30 days so I can’t return it. I feel that they are misrepresenting what processes are done to the various stones they sell, as they don’t state exactly what has been done to your stone when you purchase it.