thanks for explaining
Originally Posted by mspattemac
The lady isn't explaining it to you correctly (or probably doesn't know herself).
24 karat gold is naturally a mustard yellow color. What you see in stores is usually 18kt (which is 75% gold, 25% another alloy), 14kt (58% gold) or 10kt (41% gold). Natural gold is soft so it is mixed with other alloys to make it more durable.
You get white gold when they mix gold with alloys that will make it turn white. Most of the white gold jewelry that you see in the stores has a rhodium plate on it to give it a whiter appearance (lots of silver is also sold with a plate over it to give it a shinier look).
With time the plate will wear off and expose the metal beneath which in a lot of cases (not not always) will have a yellowish tint to it. You white gold will never look at yellow as a yellow gold ring but you will notice that slight yellow tint.
On my ring I only really notice it around the bottom where it probably gets dinged more.