Polishing machine is a special device for upgrading grade of gems. Unlike jewelry table, the gem polisher uses only one gem at a time to improve the gem's grade. This does not apply to Amethyst.
| Previous Grade | Grade's Name | Improved Grade | Grade's Name | Cost |
|---|---|---|---|---|
|
Chipped | 
|
Flawed | 1 600 souls |
|
|
Flawed | 
|
Gem (ex. Diamond) | 6 400 souls |
|
|
Gem (ex. Diamond) | 
|
Polished | 25 600 souls |
|
|
Polished | 
|
Flawless | 102 400 souls |
|
|
Flawless | 
|
Legendary | 409 600 souls |
|
|
Legendary | 
|
Divine | 1 638 400 souls |
The total price for improving one gem from it's lowest grade to highest is 2 184 000 souls