Problems sizing 18Kwhite gold

In the area of Canada where I have my shop there is very little 18K
white gold. When I do receive the odd piece for sizing, the rings are
usually quite old. I find them very difficult to work. The metal is like
spring steel. Is it possible to anneal this alloy? If so, what would be
the proper method?

HI

My method to anneal white gold is to place the shank on 2 mm steel
plate,(my is 1 1/2 by 2" ) isolating the top if necessary, hit up the
hole shank to cherry red evenly, for a minute, then leave it to cool
until you can pick it up with your hand.

cheers
good luck
Rafal