Ok A&A Ladies- need some necklace help

kevinandmonica2011

So... my dress has a lot going on up top... lots of sparkle and bling
Casablanca 1859
 




The train is also pretty be-dazzled


I will most likely be wearing my hair up in a loose, messy bun (pics from trial in bio) and have decided to go with some really gorgeous dramatic earrings...



I am totally stuck on the necklace.  I am thinking since I have so much sparkle (dress, earrings) everywhere else, I really want to go with something very simple.... but I have no idea what.  I  may not wear a necklace at all, because I really just don't want to overdo it.

Thoughts?  Suggestions?