I personally find pearls boring in most instances, unless they're oversized or overdone (and I don't mean "overdone" in a bad sense - but a multi-strand necklace would look great with that dress, over a single strand IMO). I think a pair of chandelier earrings would be stunning, and I'm jewelry-crazy so I might be tempted to add a bracelet too.
But I am assuming this is for the b'maids? If so, traditionally wedding attire and jewelry is more on the conservative side. But I'd still do a decent-sized pair of pearl drop earrings, if you're going with earrings. And no necklace then.
__________________
"Good taste shouldn't have to cost anything extra." - Mickey Drexler
I'm actually not seeing it with pearls (I know, I know- I must be sick!), but with a delicate gold lariat style necklace. Is that what its called? Where it kind of loops through itself and then hands down longer?