Whats the most common diamond color

I work for a research firm in the United States that specializes in different retail industries.  Right now, I am beginning a project researching the diamond and jewelry retail business.  I have just arrived at a very simple question, but it seems I am stuck.  I do not know where I can get the info I need.  I need to know what is the most common diamond color that people buy?  I have asked many experts, but all I can get from them is their best guess.  And like Economists, everyone has a different opinion.  That being said, it seems that most agree it’s either a G Color Diamond or an H Color Diamond.

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