Sorry to bring up an old thread but I second that. In my farming party of 3 I picked it up 1st and got a blank (1.04), my 2nd friend got the ring, while friend #3 got the bracelet. I farmed the hammer boss at least 20 times with all lives with 2 people mostly and it's dropped twice but never for me.
I'm still trying to get all of these treasures. I've farmed out the Patterned Ring with about 150 tries or so and still haven't come across it. The first boss always drops the cup, and the second boss always drops the jeweled cross. I don't ever get anything other than that. So far from these theories people have displayed, nothing seems to actually work.