Different shapes and prices

Round brilliant cut diamonds are cut from diamond rough which is more expensive for the cutters to purchase than the diamond rough used for fancy shape diamonds and with exception of the marquise brilliant, more diamond rough is lost during the cutting process to produce a round brilliant cut diamond of desireable proportions than is lost to produce a fancy shape diamond.

There is not an official proportions rating for fancy shape diamonds which is reliable at this time.  And there is not an established criteria for the use of the term "Ideal" as it pertains to the proportions of a diamond.  Thus the term "Ideal" might mean one thing with one vendor and something entirely different with another vendor.

The Radiant Cut Diamond was invented by Henry Grossbard of The Radiant Cut Diamond Company in 1976 and has been reproduced by many companies over the years but we still buy our Radiant Cut Diamonds from Henry because they seem to have something special about them.  According to Henry, there isn't a range of proportions which is published as being "Ideal" for a Radiant Cut Diamond, there is just what it is supposed to be and what isn't...

Todd L. Gray, President
NiceIce.com

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I never worry about diets. The only carrots that interest me are the number you get in a diamond.

~Mae West