Jono, correct me if I am wrong, but I think white gold only goes to 10 C, not any more.
Silver, listen to Mom, it does tarnish and would be a pain to keep clean!
White Gold used to have a extra charge on it, but, I do not think H-J says anything about on their site.
Having other than pearls in the crescent, well, I am not sure about that!
Remember, they are different sizes or graduated!
As two Brothers know, I have a Special Badge that I got from a Brother and it has the colors of LXA in it, P G and G!
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It is special and one of a kind!