Topaz GP 925 Sz 7 ring

Ring is in good condition and kept in a clean smoke free home. Marked 925 and ? Not sure.. possibly R or IS. Also marked china 7. I tested it with my presidium II and it registered under topaz. It has diamond illusion around the topaz and NO actual diamonds. It has the 1 hole underneath for the dark black color topaz. Topaz is approximately 6 mm X 4 mm. .#gemstone #925 #jewelry #topaz