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Hyper Diamond Lvl3 is obtainable from the Jewelry Store Robbery, in order to get a lvl3 one, you need to have a lvl2 hyperchrome in your inventory.
Diamond LVL3 continues to perform absolutely horribly recently. It is avoided by many traders and as of now, its pretty much impossible to get 10.5M for this item in any items. If someone is lucky enough to receive an offer for it, it almost never adds up to 10m, let alone 10.5M, that's why value adjustment is needed.
Supply is widely distributed — no single holder owns enough to register as a hoarder.