Birks diamond necklace 18k white gold

Bought from Birks a couple years ago Selling from my mom’s closet Brand New never worn No receipt but we do have the original tag Center diamond is about .47 carats (F color, VVS1) Comes with the signature Birks packaging No Birks hullmark as this is a piece from Birks’ vendor/ supplier as our sales told us. However, Poshmark will provide authentication services so buy with confidence!