Th G-Dive glove looks to me to be a SHOWA 495 glove that has the cuff custom dipped in latex to be used as a "pull over" type glove.
Even locally the dive shops are selling Atlas/SHOWA gloves at rediculous markups...a local shop wanted $59 for the SHOWA 495...the 495 is essentially the 660 with a removable yellow acrylic liner glove:
Showa 495 glove - Google Search
The sizing for the 495 and the 660 are a bit wonky, at least for me, so I have migrated to using the SHOWA 720 nitrile glove as recommended by another SB member.
The 660, the 495, and the 490 are essentially the same glove on the outside. On the inside this is how they differ:
660 - thin cotton lining (this is like a substrate for the glove to support the dipping process)
495 - same thin cotton lining but also has a removable acrylic inner glove (usually yellow)
490 - this glove has a non-removable acrylic liner that is similar in nature to the acrylic inner glove of the 495.
There is also the 460 and 465 which are essentially the same as the 490 and 495 but in orange instead of blue.
I have received samples from SHOWA of every glove mentioned in this post except the 460 and the 490 as I preferred the removable liner glove.
Looking at the DGX webpage you linked to, DGX seems to be sticking it to the customer on the price for these gloves, though they do have the overhead of typically having to buy a case (or more) of each size and I imagine that some sizes are slow movers. Still, I can't help but shake my head at the price these sell for online and at local dive shops.
-Z