Pretty dress!
Here is what i would do :
I would have my hair down ( It's you birthday which is suppose to be fun, hairup will make the fun go away "you are not going to a funeral or work

)
I would go for a silver necklace , definitely something like this
http://www.uniquetrendline.com/index.php?route=product/product&path=60&product_id=79
Hope this helps !