I have a jewelry 'dream list' a mile long, so I could go on forever, but some of my top items would be;
Cartier ballon blue in rose gold with diamonds
Pavé Cartier love bracelets
Any elaborate amazing graff diamond necklace
And I don't know if anyone remembers seeing this picture, it was somewhere in the VCA thread, and I can't for the life of me find it again, but it was a 20 motif with lapis and alternating pavé diamond motifs.. It's stunning. If I could have only one piece of jewelry, it would probably be that one