Gem rocks are a unique type of rock that yield gems, rather than ore, when mined. 40 Mining is required to mine these rocks. Gem rocks take about a minute and twenty five seconds to respawn, though the rate changes depending on how many players are connected to the server. When all nearby rocks have been mined, players can hop worlds to get access to unmined rocks. The chance of mining an additional ore while wearing Varrock armour does not apply to gem rocks.