How to upgrade the destiny gem of milk block t7?

Red crystal. Milk Building Block is an introduction to a sandbox game. Players can play BOSS, or they can build all kinds of buildings and build their own villa homes at will. T7 Destiny Gem is a material that can be made into a higher-level building tool in the game. According to the information released by official website, t7 Destiny Gem needs three rubies to upgrade.