Gears can be evolved to increase its star rating and maximum level. Additional stats may also appear(Depending on the Gear) when its star rating increases. You can evolve a gear using its respective Gear Shard or Shard Replacements(Bronze, Silver, Gold).
★★ - When the gear reaches level 15, it can be evolved and requires 50 Shards(Equipment Shard or Bronze gear Shards)
★★★ - When the gear reaches level 20, it can be evolved and requires 75 Shards(Equipment Shard or Silver gear Shards)
★★★★ - When the gear reaches level 25, it can be evolved and requires 100 Shards(Equipment Shard or Gold gear Shards)
Transmuting Gears - You can transmute gears once you've acquired the minimum gear shards required. The amount of Shards varies on the gear's rarity.
★★ - 50 Gear Shards
★★★ - 80 Gear Shards
★★★★ - 150 Gear Shards
★★★★★ - 777 Gear Shards