No known way to get this in the game yet.
Decomposition (Cost: 1,000 Kina (Bound))(Guaranteed)
EnchantItemQuantity
base Enhance Stone x6= 5 + 1
+1 Enhance Stone x11= 10 + 1
+2 Enhance Stone x21= 20 + 1
+3 Enhance Stone x41= 40 + 1
+4 Enhance Stone x61= 60 + 1
+5 Enhance Stone x91= 90 + 1
+6 Enhance Stone x1
+7 Enhance Stone x1
+8 Enhance Stone x1
+9 Enhance Stone x1
+10 Enhance Stone x1
+11 Enhance Stone x1
+12 Enhance Stone x1
+13 Enhance Stone x1
+14 Enhance Stone x1
+15 Enhance Stone x1