I have a 10K Yellow Gold Swirl Band Blue Topaz Ring, hallmarked RA and also has the letters SI on it. There is a small diamond on the band as well. The Blue Topaz is cut nicely on the front (Oval Shape), but the back side isn't cut at all. It actually looks dirty and gritty, does not show any blue. I have cleaned it in warm soapy water several times. I have looked at it with a 16 Power Loupe, and it looks like little craters of gray and black. The front looks nice, but the backside looks nothing like the front. Is the Topaz a fake? Topaz tested positive on a Presidium Gem Tester, and the Diamond did too. Diamond looks great under the loupe. Thank you.