The crown representing Sagittarius, the ninth position of the zodiac. The birthstone, Zircon, is embedded.
It has been modified to suit the OS weapons.

For each 2 Refine Levels:
ATK +20

Refine Level +7:
Decreases variable cast time by 15%.

Refine Level +9:
Increases ranged physical damage by 15%.

Refine Level +11:
Increases physical damage against enemies of Small and Medium sized enemies by 15%.
Decreases fixed cast time by 0.2 seconds.

When equipped with Burning Knuckle-OS:
Decreases Rampage Blaster skill cooldown by 1 second.

For each 2 Refine Levels of Burning Knuckle-OS:
Increases ranged physical damage by additional 3%.

When equipped with Saphir Mace-OS:
Decreases variable cast time by additional 10%.

For each 2 Refine Levels of Saphir Mace-OS:
Increases damage of Acid Demonstration by 3%.

When equipped with HR-S55-OS:
Increases ranged physical damage by additional 5%.

For each 2 Refine Levels of HR-S55-OS:
Increases damage of Hammer of God by 3%.