This lovely gown worn by Anna Kendrick demonstrates my point well. Where would you even put a necklace? Her earrings are lovely though and typical of the looks worn last night.
The look of the night seemed to be long dangle earrings in all manner of construction to very large rings and a few still large cuff bracelets.
A couple of notable exceptions to the look were Julia Roberts in a long vintage style pendant necklace and Lisa Edelstein with a brooch at her cleavage. These two looks seemed somewhat out of place for the consensus of the other stars, but I give them kudos for originality!