Did some googling and some sources report 0.25g and others 0.5g. Image of bday email
BITGOLD’S BIRTHDAY GIFT
To spread the love on your birthday, BitGold is giving you 0.5G in Gold just for being a loyal customer.
Celebrating your birthday is an awesome event, but BitGold just found a way to make it better.
When your birthday comes along (based on your verification inputs) you will be sent an email notification and a subsequent transfer of funds directly into your account.
To sign up and get started with FREE 0.25 grams of Bitgold worth ~ $14, click on my referral link https://bitgold.com/r/MqnHEk
These amounts are not guaranteed (from what i have received anyway)
http://gyazo.com/ec99023f31a452639c6617c02d96e3cb