SeanT,
There are three main categories you have your gold maxima's which tend to be the least exspensive, then your 1st grade which are your basic blue-purple with simple patterns, and then you have your ultra maxima's which are your exstravagant colors and have rare unique patterns. Hope this helps.
I'd also add that many wholesalers that don't deal with clams exclusively actually have 4 grades of clams; electric, being the best, ultra, first, and second, with color intensities and patterns correspondingly less impressive.
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