I think what GIA should be doing is advising consumes to discuss these aspects with their jeweler.
Of course nowadays, a larger and larger percentage of buyers are going to go the "virtual" route. So their jeweler" is a rather faceless internet site.
Looking at GIA's entire marketing plan, they are going in that direction as well.
By that I mean designing their literature to be aimed at vd customers ( virtual diamond, get your mind out of the gutter).
Think about it- when looking at the VD model- it is in the seller's best interest for the consumer to gain a sense of empowerment buying a diamond based on stats.
This inevitably lead ( note the past tense) to more and more stones being cut to specs that are deemed"acceptable to this demographic- let's call them "numbers people"
The diamond business is large enough that little fish like us can find "clear channels" that is to say cutters that still cut based on other aspects ( creativity versus raw numbers)- but the overall effect has been pervasive.
There's a lot more rounds- and more of these rounds are being cut with the smaller tables associated with idea" cut diamonds.
Eventually this has driven up the prices of other shapes due to scarcity. Which will eventually lead to more f other shapes being cut.
For now, it seems that other shape will be cushion- is it's a hot shape now.
But thank goodness cushions are by nature, more "different" than the same from stone to stone.
And also to the fact that many people do consider Y-Z to be fancy - no matter what GIA says.
BUT- prices are creeping up and up . Even though its a general rise- FLY has risen as well- the percentage difference between Y-Z and FLY has gotten smaller. Significantly so in the larger sized diamonds.
Other people are boarding this train.....