I have never heard it called a Glitter Cushion before. Other jewelers or consultants refer to them as Crushed Ice Cushion. Which is the correct term? Same with the Glam Cushion - what is that? The only names I have ever come across are old mine, brilliant, cushion modified "crushed ice," and cushion modified "hybrid. From what you're describing in glam sounds like the Old Mine cushion cut. For me the most beautiful Cushion is the brilliant Cushion - can't beat it's sparkle compared to the other cushion cuts.
This is true, I had the same thought. For those who don’t know, the real cut names for these diamonds are: Crushed ice (they refer to it as glitter in the video) Brilliant Antique cut (they refer to it as glam)