Plant it to grow Ruby Block. Considering the size, this is the most valuable ruby in existence. But it's only a video game.
Ruby Block Seed price in Growtopia: sells for about 1 DL 50 WL, buyers pay about 70 WL (median of 3 offers from community Discords, past 30 days). Live price chart and the latest buy and sell offers.
Recently sold at: ZKXLK