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Hyper Diamond Lvl4 is obtainable from the Jewelry Store Robbery, in order to get a lvl4 one, you need to have a lvl3 hyperchrome in your inventory.
Diamond LVL4 is currently performing insanely good, with it commonly going for 29M offers (such as Power1 + Torero), and at times even more. This is simply impossible to get for 28-28.5M, as most owners expect upwards of 29M for one. Its most common offers include: Laser Cannon (Diamond LVL4 side may need slight adds due to demand), Power1 + Torero or Icebreaker + Parisian.
Supply is widely distributed — no single holder owns enough to register as a hoarder.