If you have golds, this would make them and reliable form of experience(close to crimsons?).
So i would use golds, because: Yes, you use longer time to reach the 200k exp limit, BUT, you wil still get free 200k exp from it, and this will be and bigger advantage from golds because they're not as good exp as crims without the necklace...
My point being that you will utilize a form of less experience to achieve greater exp, contra using it with crims wich would only get you fast experience.