Gemcorns - Official Terraria Wiki

↑ Information taken from the Desktop 1.4.2.3 source code, method SetGemTreeDrops() in Terraria.WorldGen.cs. There may be inaccuracies, as the current Desktop version is 1.4.4.9. ↑ Information taken from the Desktop 1.4.2.3 source code, method GrowTreeWithSettings() in Terraria.WorldGen.cs. There may be inaccuracies, as the current Desktop version is 1.4.4.9. ↑ Information taken from the Desktop 1.4.3.6 source code, method UpdateWorld_UndergroundTile() in Terraria.Worldgen.cs. Worldgen underground random update go from the surface to the bottom of the world which represents about 70% of the world, 0.0015% of the total world size is updated randomly each non accelerated tick and each time one of the two tiles of the sapling is updated, there is 20% chance that it grows (as long as it can grow). The chances of the sapling growing each tick is about (0.0015%*worldArea)/(70%*worldArea)*20%*2 = 8.571×10^-5 if we ignore the ticks where one or both tiles of the sapling get updated mutliple times, so it would require about 1/(8.571×10^-6) = 11667 ticks which represent 11667/60/60 = 3.24 in-game hours There may be inaccuracies, as the current Desktop version is 1.4.4.9.