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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 unsurprisingly continues to perform horribly in trading, with it going for quite hefty underpays. The demand for this item is still extremely small, due to grinders not being interested in trading for this item all that much, because of how expensive it is. This in turn makes Diamond LVL3 an extremely unappealing item for both traders and grinders, causing its owners to take big underpays as a result to get rid of it. It's most common offers include: Raptor + Samurai, Volt 4x4 + Iceborn or Diamond LVL3 + JBX/Revox for M12.
Supply is widely distributed — no single holder owns enough to register as a hoarder.