White gold tubing

Hi all! I have a quick question for you. I need some 14k white gold
tubing, but the manufacturers only have it .5mm wall thickness. I
would perfer 1mm wall thickness but with a maximum diameter of 3mm. Do
you have any suggestions for making the tubing or would it be better
to cast a piece, or drill thru thick wire? I’m using the tubing for
part of a ring for setting diamonds and saphires but I want it to be
durable and I think if it’s to thin it will dent (the tubing areas are
on the outside of the bridge so it will get bumped around by the
client)

Looking forward to hearing your replies, Tara Blokzyl. From
Beautiful British Columbia (Canada) where the sun is shining, the
creek is roaring and everything is so green and lush!