Pink Tourmaline Sterling Silver Ring

The first thing to say about this ring is that I am not an expert on gemstones, so pink tourmaline is simply my best guess. There are two pretty flowers on either side of the stone, with pretty ornate carvings. It is sterling silver, as can be seen by the stamp noted on the inside of the ring (best shown in photo 13). Unfortunately I cannot quite make out the maker's mark, it appears to say "RK" but I can't be 100% certain. There are further inscriptions/engravings/stamps which I have photographed to the best of my ability (but still can't make out). The ring is definitely on the smaller side, so could be a child's ring or a ring for a very small-boned woman. The size can be seen in the last 2 photos, sitting right at the U.S. size 4.5 notch, or 8 mms. Very pretty, great for an October birthday, or just for someone who loves all things pink!