Checking all the images with hands, esp right hands, I found, including yours, a similar shot taken by the same camera (which is not as clear as yours) and an iffy one with Condits hands folded. It's POSSIBLE he is wearing a ring but its hard to say for sure, could just be his wrinkly hide. Pretty much useless.
Your photo is the only clear shot with a ring. I blew up the image and futzed around with unsharp mask, and color and contrast.
With the limited resolution, results were marginal at improving the image. But, in my opinion, it DOES have a round center part flanked by two light areas which may be stones.
I'm sure by now you've blown up the image and tweaked it. Do you see what I see?
BTW, I have a dim recollection of an old article telling how Chandra gave him a ring similar to her own. It could be false memory syndrome - I'll have to see if I can dig anything up.