Gemstone Prices??

Is there a website or anything that can tell me how much certain gemstones are worth? I'd like something that would tell me how much they are worth per carat, and maby for the certain colors and qualities. I know the 4 C's would change alot of that, but I was hoping if there was a site that could tell me... show more Is there a website or anything that can tell me how much certain gemstones are worth? I'd like something that would tell me how much they are worth per carat, and maby for the certain colors and qualities. I know the 4 C's would change alot of that, but I was hoping if there was a site that could tell me all I need to know, about how much certain gemstones are worth per carat, ect. Also, do the gemstone prices fluctuate like gold and silver prices? Thanks
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