Originally posted by: bozack
Can't add too much to Alkemyst's post other than the fact that not all white gold is rhodium coated, in fact in Europe selling coated white gold or white gold made with a high nickle content is no longer allowed due to the few reactions some had to nickle...now a good deal of white gold overseas is made with Palladium I believe....also some white gold is just heavily saturated with nickle and not plated at all, only problem with this is it isn't highly white and you are more likely to show an allergic reaction to nickle, that is if you are allergic to it in the first place.
Well what i meant to say above was white gold looks like platinum due to a rhodium coating...that's the purpose of it. But white gold is white due to nickel mostly.
Also Alkemyst is incorrect in saying that white gold is *stronger* than platinum, white gold is more resistant to minor surface scratching than platinum due to its higher rigidity(sp?) and in some cases its rhodium coating, but platinum is definately a stronger more lasting metal (which alke pointed out under plats properties), chances are at one point in a lifetime a gold ring with heavy wear will have to have a shank repair done whereas plat should last well beyond a normal persons life. As for settings, generally platinum is preferred, in fact I have yet to meet a jeweler that does not do all of their setting work in plat.
One average a platinum ring will outlast gold by 3 lifes. However, gold is very scratch prone compared to platinum which has a very high abrasion resistance (scratches). In regards to strength, it depends on what you are defining it as.
Platinum has a higher tensile strength. Good for prongs and the like, but it's a dead metal and not very 'stiff'. Gold is almost always 'springy' which can give it some resistance to breakage.
With platinum you bend it to the stone and it stays, with gold you have to go a little beyond as it will spring back (albeit extremely little), setting a stone is a dangerous part of jewelry....this is where a million dollar diamond can be chipped.
As for which to get it is really a matter of taste and budget...if you don't like a heavy ring then don't get plat, if you like a heavy ring and want something that will last forever and don't mind spending nearly three times as much then get platinum....personally my college ring is 14K white gold and my wedding band is platinum, I like them both but the white gold ring is alot more comfortable due to the weight savings.
It's all on economies of scale. Most of a platinum jewerly piece's price is from the extra costs in working with it, not the extra value of the small amount of plat. If you are dealing in diamonds around the 1/2 carat mark or low quality/cheaper stones than the setting is significant. If you are dealing with high quality diamonds or larger ones then the setting becomes less than the tax you will pay pretty quickly.