Going through Charley Project looking for possibles. I haven't found anything too interesting so far.
http://www.charleyproject.org/cases/s/smolinski_william.html
similar necklace but circumstances make it highly unlikely. Also at six feet, he's too large, and no mention of injuries.
http://www.charleyproject.org/cases/s/stevenson_walter.html
Missing from Memphis in October 2009. He's the right height, but there should have been additional jewelry found. No injuries.
http://www.charleyproject.org/cases/b/buonassisi_alex.html
Missing from Phillie in 2006
http://www.charleyproject.org/cases/j/jones_el.html
Would be good, but namus says the uid is white and Jones is black. But wearing a diamond-cut Figaro necklace (figaro is a style of link) with a diamond cut cross, so he has similar taste in jewelry.
http://www.charleyproject.org/cases/m/martin_wilbert.html
Here's a mentally handicapped guy who went missing from Arizona in 2004, and has some injuries that might match up with the UID's. Also jewelry. He's a small man, possibly even too small.
http://www.charleyproject.org/cases/p/peasha_gerald.html
http://www.charleyproject.org/cases/q/quintana_israel.html
Missing 1992 from Phoenix, right size and in the age range, and some injuries that might be similar.
http://www.charleyproject.org/cases/h/haas_christopher.html
Missing July 2010 from Ohio; has similar injuries including fractured ribs but is a bit on the tall side at 5'11"
http://www.charleyproject.org/cases/c/charping_mack.html
Missing since December 2008 from Louisiana; has multiple injuries including broken nose and ribs. He's much larger at 6'1" though
http://www.charleyproject.org/cases/r/riegel_lawrence.html
Missing since Christmas 2009 from Washington, was recovering from neck surgery, but again, much too tall.
http://www.charleyproject.org/cases/p/pottinger_jeffrey.html
Ditto, except missing from Ohio
http://www.charleyproject.org/cases/g/griffith_joseph.html
another one, June 2010 from Tucson
ETA: a UID in Colorado estimated at 5'4" has just been identified as a 6-foot missing man:
CO CO - Golden - WhtMale Skeletal UP10876, 21-57, in Red Rocks Park - Dec'12 - Websleuths Crime Sleuthing Community So I don't think I'm going to eliminate any of these guys.