I want to buy a new small pearl necklace. What are some suggestions on where to purchase one?

I want to be a flapper for Halloween this year and was wondering if anyone has found a good place to buy a long flapper-type pearl or faux-pearl necklace that you can knot on the bottom?

It’s kind of a weird question, but where is the hole thing?
There is a place where I THINK is supposed to be it but its towards the bottom..? xD

i love adding little accessories to my phones. i have had samsung phones in the past and they always had a little opening to put cute charms/accessories. i plan on getting the white blackberry pearl 8100 and was wondering if there was any place to put a charm. i’ve been looking at pictures but don’t seem to see any. if anyone has it/info about it, please let me know. thanks!