Sh3rry, nothing to be stuck about here... a princess is only a princess if she has squared (sharp) corners, since by definition, a princess is a "brilliant-cut square." The princess cut has been around since the 1980s and features 90-degree corners – a true square. Nowadays, the term is more loosely used to describe a host of "brilliant-cut square" diamonds that are, more, or less, close to perfectly square.

David can tell you more about the radiant cut. Short story is that  in the 1970s Mr. Grossbard patetented a rectangular brilliant with cut, or slanted, corners. He called it the radiant cut. I may be incorrect here, but, I understand the importance of the radiant is that it was the first cut design to feature brilliant-cut facets on both crown and pavilion. Again, we sling the name "radiant" around to describe a host of rectangular diamonds with slanted corners... and, since the name "radiant" was patented, we may be taking liberties here with the title "radiant," but, you get the idea...

Trinkette's Cliff Notes:
Princess = brilliant-cut square
Radiant = brilliant-cut rectangle with slanted corners

Also, the size charts can only help give you an approximation of carat weight. There are many details determining carat weight that a simple face-up size chart can not factor. Really, the only way to truly know the weight, as well as all the other aspects of a particular stone, is to have the stone unmounted and inspected by a trusted professional. And, yes, different shapes with similar face-up sizes most definitely will have different general carat weights.

I am a little confused by that T.   The difference is the cut corners on the radiants, not so much square vs rectangular,  right?  I have a square radiant and while I believe square radiants are less common, they definitely exist. 

Aspect ratio (square vs. rectangular) does not matter, even though the original princess cut - which has a pavillion based on the baryon cut of the 1960 - does not really work with high aspect ratios and it needs do be modified.

Sorry... I'm obnoxious today. I forgot this: 


I'll be quiet now.

I found a patent filed in 2001 (assigned to M. Fabrikant & Sons, where David used to work) for a cut cornered Princess.



What do you think, Sh3rry?

Mikla

I want to  give you a gift  sorry it's a lame one to you. 

If you compair that with this photo they look alike huh?

I think I found it.. Is this what you found?

Look into the diamond and you’ll see a flower at its core.” The Wondercut™, a new brand by special cut pioneers Lili Diamonds, makes this promise come true. Based on the square shape of the princess, the Wondercut™ offers the brilliance, fire and light return of a round stone, with a unique feature – the shape of a flower at its core.

yes I did..