Rose gold is an alloy of pure yellow gold. Pure gold when mixed with copper gives a reddish color. Depending on the proportion of the copper in the mixture the color may vary from Red to Pink or Rose. White Gold is also an alloy of Gold and nickel or palladium.
Source(s):
http://en.wikipedia.org/wiki/Gold_alloys#Rose_gold_alloys

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99% percent of general value can be judged just by taking into consideration the color, item, carat (karat) quality and the weight alone. The popularity of the rose gold's color, the karat quality, the nice weight that gold is known to have, and the quality of the design of the item.

Rose gold is a mixture, a gold and copper alloy. That is why it has a characteristic 'pink' or 'rose' tint to it. It's less flashy than yellow gold, and was rarely used in jewelry until recently. It's definitely becoming more popular. All gold is alloyed, meaning it's mixed with some other metal because it is too soft on its own for wear. The difference with rose gold, and other colored golds, is that the proportion of metal has been increased to give it a characteristic tint. You'll still get your full gold karats, however. So don't worry about not getting your money's worth in gold weight. Rose gold is another design element jewelers can add to gold jewelry to create appeal for the customer. Some designers tailor the mix of metals to promote their own trademarked shade.

Rose gold is generally as expensive as yellow gold. White gold surpasses both of them in price, due to popularity. If you want to determine true value, then you will want to consider the ring's gold content in terms of karat weight. 14kt is 14 parts gold to 10 parts alloy, 18 kt is 18 parts gold to 6 parts alloy, etc. Whether it's white, yellow or rose gold, it will have the same gold content. The higher the gold content, the more subtle the rose color will be, and the better it will hold up to wear. 18 kt is preferred for ladies. You should also consider the design of the piece, because custom work is priced higher. Look at the color, how much work was put into the piece. Does it look polished and complete, are the edges carefully worked?

For an 18kt rose gold ring, it would consist of 75% gold, 21% copper and 4% silver, typically. The highest gold content rose gold is 'crown' gold, at 22kt. 14kt is called 'red' gold, generally originates in the Middle East, and has a content of %41.67 copper. Ultimately, you should purchase a piece that's beautiful to you, reflects your taste, and is something you will love. That is what will make your work of precious metal truly special.
Source(s):
http://urbanemagazine.ca/articles/pretty.in.pink.gold/

http://news.infibeam.com/blog/news/2008/09/30/damas_celebrates_roberto_coin...

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