Hi Alan, I found several items that could be used to track jewelry.
I have Lo-Jack tracking on both my cars. I helped prove the
feasibility back in 1960, it uses Loran. Most Police cars that have
4 antennas on the top have it installed.
I went to the Google search engine, typed " Satellite Tracking
Device " (without the quotes) and got hundreds of hits. These use
GPS tracking. Much more accurate, to within a few feet. Heres a
This one seems to be the standard, many people sell it at different
http://www.trackingproducts.com/ this one seems to be one of the more
Applied Digital Solutions http://www.digitalangel.net/default.asp
http://www.gpstrackingtechnologies.com/st-jr.html Shadow Tracker
Jr.....this looks like the one....1"x2"x3"....pretty small
Love and God Bless