Can't comment on the diamond but white gold is a pain as it discolours and has be to redone every few months. Its a money making racket at this stage. Unfortunately yellow gold is 'out of fashion' at the moment hence the Cash for Gold outlets.
I have no idea if the price is the going rate or not but having read Why Diamonds are a sham I suspect it is 'worth' considerably less than that and has probably been the cause of a lot of hardship en route from the ground to the shop.
I've seen pictures of how some diamond mines operate and it's not nice.
I don't know about others but knowing all that takes the sparkle out of diamond ownership for me.
My rings seven years old, white gold; once Iv got them rhodium plated, they dont discolour but rather the white gold wears off showing the yellow gold underneath. €30 a ring. However husbands wears very badly, depends on what you do/how much wear.
Platinum more expensive but heard it scratches easily and rings of same age iv seen looks a very heavy grey.
gold is out of fashion but have seen some lately appear but most people first thought is they spent less...
I genuinely haven't a scooby. The only thing I picked up on was the clarity bit, I recalled reading this blog and the guy mentioned being careful about Si1 clarity. So I went looking for it, have a browse around this website - he is really informative! http://www.voltairediamonds.ie/blog/ (no connection)