Naturally, the higher the grade of a Celestial Weapon, the higher its value. However, the difference in value between two grades of Celestial Weapon below the King Grade would not exceed ten thousand Celestial Crystals. For example, a Duke Grade Celestial Weapon normally costs 1000 mediocre Celestial Crystals or ten prominent Celestial Crystals whereas a prominent Celestial Weapon normally costs ten mediocre Celestial Crystals; a difference of 100 times in value. On the other hand, King Grade Celestial Weapons were 10,000 times more valuable than Duke Grade Celestial Weapons! Nobody in their right mind would be willing to trade a King Grade Celestial Weapon for 10,000 Duke Grade Celestial Weapons.
"It's a King Grade Celestial Sword!"
"Heavens! Young Master Han obtained a King Grade Celestial Sword!"
"A King Grade Celestial Weapon is worth at least 100,000 prominent Celestial Crystals… Young Master Han has hit the jackpot this time!"