i guess a 9k gold filled meaning its a stronger gold more durable than a 14k or 10k.it dosent bend as easy. i found this statement off of the description from the last owner. i hope this helps.its very pretty was just to big for my hand.
I owned it before, very beautiful ring. I didn't wear it. Filled means bonded to other metals. That's why it's stronger than solid fragile gold. Good luck with auction!