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Hyper Diamond Lvl5 is obtainable from the Jewelry Store Robbery, in order to get a lvl5 one, you need to have a lvl4 hyperchrome in your inventory.
With more people being interested in hyper grinding, there's a lot less interest in trading for LVL5's, Diamond being one of them. While it can still get quite good offers, its more comparable to Pink LVL5 in terms of its demand, and is being heavily overshadowed by Diamond LVL4, as that currently gets way better offers than the LVL5 one does.
Duped Diamond LVL5 has suffered a demand loss, as it is no longer performing as well as the clean variant and is now more comparable to duped Blue LVL5, albeit slightly better than it. Most of the attention has shifted to the lower levels (3-4), as more and more traders are going for those to grind them up.
Supply is widely distributed — no single holder owns enough to register as a hoarder.