yellow gold, white gold, rose gold - what are the long term issues?

[FuzzyB]

Thirdly, are there any ageing issues with 18k yellow gold?

TimeZone just posted an excellent comparison photo that shows how Lange's yellow gold patinates over over 12 years.

http://forums.timezone.com/index.php...89#msg_7166770

The clasp on the left is new and unworn, the center is 12 years old and worn regularly, and the one on the right is 12 years old and unworn.