Personally, I like the Sabres (silver and golden) and the Vaquero for jewelry hunting. They are all very sensitive to gold. In fact, a few weeks ago, I found a 24K gold medallion which weighed in at only 0.4 gram with my Vaquero in a kid's sand pit and then last week, I got 2 14k rings (each weighed about 1.5 g) with my Golden umax underneath some trees at a local school I hunt quite often. I would qualify these ring finds as "small gold" and the pendant as "tiny gold" - so this proves to me that the Tesoros I own are definitely doing the job for me in the gold dept. I have heard some praises about the Compadre, but I would have to see one in action before I really believe it is that much better than a Vaquero for small gold. I use a Vaq with the 5.75" coil and it has gotten me plenty of small silver and gold jewelry items - I am very happy with it.
My recommendations for you would be either a Silver uMax, Golden uMax, or Vaquero for jewelry. Compadre is probably also a good choice, it's just that I haven't had the pleasure of using one yet. Also, it's really helpful to use the smaller coils for jewelry hunting - of course for big rings they don't matter, but since most gold items that I find are relatively small in size(< 3-4 g per piece), the small coil really helps to pull those small golds out of trashy spots.
Thanks,
Mark