I was working Low Tide Monday afternoon, Socal Beach with my Xcal II....I ran across about a 60ft square section in the wet sand full of jewelry, I pulled out 59 pieces of jewelry, it took me over 2.5 hrs to get it all.....Most of it is junk out of the 8 rings 1 is stamped "UP 10K" 3 of the rings have stones..Some of the pieces are silver that one big bracelet is pewter, the watch is junk....I guess I will focusing on low tide now...The rock comes up as a nickel tone in disc mode not sure what it is made of, it came out of the same 60 sq ft patch....the only trash I found in all that patch of jewelry was 1 penny and one hook...I was running in pinpoint mode when I hit this patch of jewelry...Any ideas about the rock???