https://www.cgtrader.com/3d-print-models/games-toys/board-games/green-lantern-d20-dice
GL D20, dimensions: 24.49 x 22.88 x 20.00mm or 0.96 x 0.90 x 0.79in
Scale up or down as needed, current scale is accurate for game play.
250k Poly.
If you need any help with the file let me know.
Prints great in resin.