Refine 3 ring spirits of the same level to get a high level

x3 Lv 1 and 500,000 gold = Lv 2
x3 Lv 2 and 1,000,000 gold = Lv 3
x3 Lv 3 and 3,000,000 gold = Lv 4
x3 Lv 4 and 5,000,000 gold = Lv 5
x3 Lv 5 and 10,000,000 gold = Lv 6