Gradehttps://irowiki.org/wiki/Grade

Lv 5 Weapon and Lv 2 Armor can be enhanced by increasing its grade, which will give various bonuses. Higher grade equipment retains all the bonuses from the lower grade, and will also give bigger bonus from refinement. Talk to S'ratos (grademk 34/184)Paste Ingame to do grading and crafting grade materials.

• Grading equipment successfully will reset its refine rate to +0.
• All enchantment and cards will be preserved during grading process.

Grade	Required Refine Rate	Materials	Failure	Success Chance	OPTIONAL: Additional Materials for +1% Success Chance (Max of +10%)
No Grade → D	+11	1 Ether Aquamarine + 100,000z	Equipment Break	70%	1 Blessed Ether Dust (max of 10 pcs)
		5 Ether Aquamarine + 500,000z	Equipment Preserved
D → C	+11	1 Ether Topaz + 125,000z	Equipment Break	60%	3 Blessed Ether Dust (max of 30 pcs)
		5 Ether Topaz + 625,000z	Equipment Preserved
C → B	+11	1 Ether Amethyst + 200,000z	Equipment Break	50%	5 Blessed Ether Dust (max of 50 pcs)
		5 Ether Amethyst + 1,000,000z	Equipment Preserved
B → A	+11	2 Ether Amber + 500,000z	Equipment Break	40%	7 Blessed Ether Dust (max of 70 pcs)
		10 Ether Amber + 2,500,000z	Equipment Preserved

Ether Dust is dropped from any monster in level 200+ dungeon. Amber is sold by Jewel Merchant (moc_ruins 110/105)Paste Ingame

Item	Zeny Cost	Materials
Ether Stone	100,000z	5 Ether Dust
Blessed Ether Dust	100,000z	5 Ether Dust	1 Blacksmith Blessing
Ether Aquamarine	100,000z	3 Ether Stone	1 Aquamarine
Ether Topaz	200,000z	6 Ether Stone	1 Topaz
Ether Amethyst	300,000z	10 Ether Stone	1 Amethyst
Ether Amber	500,000z	15 Ether Stone	1 Amber

• Total Ether Dust needed just for grading from No Grade to Grade D is 75. Each attempt for No Grade to Grade D costs 75 Ether Dust (15 Ether Stones).
• Total Ether Dust needed just for grading from No Grade to Grade C is 225. Each attempt for Grade D to Grade C costs 150 Ether Dust (30 Ether Stones).
• Total Ether Dust needed just for grading from No Grade to Grade B is 475. Each attempt for Grade C to Grade B costs 250 Ether Dust (50 Ether Stones).
• Total Ether Dust needed just for grading from No Grade to Grade A is 1225. Each attempt for Grade B to Grade A costs 750 Ether Dust (150 Ether Stones).

• Year 20XX
  • Grading with lower refine rate requirement (same materials, lower success rate) added.
    • No Grade → D
      • +9: 10%
      • +10: 20%
    • D → C
      • +10: 20%
  • Grading rates for +16 and above equipment is also increased by an additional 10%.