Found a nice link.
http://www.dyjewels.com/je_karat.shtml
another link
http://www.eternityweddingbands.com/education_gold.asp
Quote:
Color
Gold does not tarnish or corrode, and while being a very strong metal, it is also the most malleable. Gold is therefore usually mixed, or alloyed, with other metals. This not only hardens it, but also influences the color. For example, white shades (and thus white gold) are achieved by alloying gold with silver, nickel or palladium. Yellow and white gold have very similar malleability and strength.
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This is why I can't wear any gold higher than 10K, because it gets bent, folded, spindled and mutilated quickly on me. Chains, rings, bracelets, don't matter. I destroy it.
This is why my wedding ring is aircraft grade titanium.