> For the complete documentation index, see [llms.txt](https://guildqb.gitbook.io/qb-goldrush/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guildqb.gitbook.io/qb-goldrush/play-game/alchemy/gem-upgrade.md). # Gem upgrade

The "Gem upgrade" function allows you to combine gems of the same carat to increase their carat number, which in turn boosts the gem's stats proportionally. The upgrade process starts with a "1-carat" gem obtained by processing raw stones. For example, combining two 1-carat gems will create a 2-carat gem. As the carat number increases, the gem's performance improves, benefiting the player's overall performance and mining efficiency. This upgrade system enables players to acquire higher-stat gems, allowing them to progress more effectively in the game. *** ## Ruby

Carat	Status	Increase rate
1 Carat	Mining Power	0.10%
2 Carat	Mining Power	0.25%
3 Carat	Mining Power	0.65%
4 Carat	Mining Power	1.70%
5 Carat	Mining Power	4.45%
6 Carat	Mining Power	11.65%
7 Carat	Mining Power	30.50%

*** ## Emerald

Carat	Status	Increase rate
1 Carat	Safety	0.10%
2 Carat	Safety	0.25%
3 Carat	Safety	0.65%
4 Carat	Safety	1.70%
5 Carat	Safety	4.45%
6 Carat	Safety	11.65%
7 Carat	Safety	30.50%

*** ## Topaz

Carat	Status	Increase rate
1 Carat	Luck	0.10%
2 Carat	Luck	0.25%
3 Carat	Luck	0.65%
4 Carat	Luck	1.70%
5 Carat	Luck	4.45%
6 Carat	Luck	11.65%
7 Carat	Luck	30.50%

*** ## Sapphire

Carat	Status	Increase rate
1 Carat	Mining Power	0.50%
2 Carat	Mining Power	1.25%
3 Carat	Mining Power	3.25%
4 Carat	Mining Power	8.50%
5 Carat	Mining Power	22.25%
6 Carat	Mining Power	58.25%
7 Carat	Mining Power	152.50%

*** ## Aquamarine

Carat	Status	Increase rate
1 Carat	Safety	0.50%
2 Carat	Safety	1.25%
3 Carat	Safety	3.25%
4 Carat	Safety	8.50%
5 Carat	Safety	22.25%
6 Carat	Safety	58.25%
7 Carat	Safety	152.50%

*** ## Amethyst

Carat	Status	Increase rate
1 Carat	Luck	0.50%
2 Carat	Luck	1.25%
3 Carat	Luck	3.25%
4 Carat	Luck	8.50%
5 Carat	Luck	22.25%
6 Carat	Luck	58.25%
7 Carat	Luck	152.50%

*** ## Peridot

Carat	Status	Increase rate
1 Carat	Mining Power	1.00%
2 Carat	Mining Power	2.50%
3 Carat	Mining Power	7.00%
4 Carat	Mining Power	18.50%
5 Carat	Mining Power	48.50%
6 Carat	Mining Power	127.00%
7 Carat	Mining Power	332.50%

*** ## Alexandrite

Carat	Status	Increase rate
1 Carat	Safety	1.00%
2 Carat	Safety	2.50%
3 Carat	Safety	7.00%
4 Carat	Safety	18.50%
5 Carat	Safety	48.50%
6 Carat	Safety	127.00%
7 Carat	Safety	332.50%

*** ## Garnet

Carat	Status	Increase rate
1 Carat	Luck	1.00%
2 Carat	Luck	2.50%
3 Carat	Luck	7.00%
4 Carat	Luck	18.50%
5 Carat	Luck	48.50%
6 Carat	Luck	127.00%
7 Carat	Luck	332.50%

*** ## Diamond

カラット数	効果	増加率
1 Carat	All stats	1.50%
2 Carat	All stats	3.75%
3 Carat	All stats	9.75%
4 Carat	All stats	25.50%
5 Carat	All stats	66.75%
6 Carat	All stats	174.75%
7 Carat	All stats	457.50%