I've been looking for some sort of jewelry I can wear in P's memory (in addition to his wedding ring, which I already have on my left middle finger), and I think I've finally found it:
Black Titanium Soulmate Ring
"Anam cara" doesn't really mean "soulmate," it means "soul friend," like a confidant you discuss things with. P was a very introspective person and we had lots of deep talks, so it seems appropriate in both sense of the word.
There's room inside the ring for an inscription, and in a nice bit of serendipity, one of the engraving styles you can get is called "Vanessa." Clearly it's meant to be mine ... now if fate could just send $600 my way too, that would be great.