I couldn’t verify a 500-gem to Robux conversion for 99 Nights from a direct in-game source, but the public pricing I found shows 100 Diamonds = 400 Robux and 250 Diamonds = 900 Robux. That implies 500 gems would be about 1,800 Robux if the game’s gem-to-diamond pricing is linear.

Quick Scoop

  • 100 Diamonds cost 400 Robux.
  • 250 Diamonds cost 900 Robux.
  • 500 Gems is roughly double 250, so the nearest estimate is 1,800 Robux.

Note

This is an estimate based on the published diamond bundles, not a confirmed standalone 500-gem pack. If the game uses a different item name or a separate shop, the exact price could differ.