Gem Mine (Builder Base)

Builder Base Buildings

Resource Building

Updated: 18 September 2026 · By the Goblins Farm team

Gem Mines access a rare deposit of this highly valuable resource! Mining Gems is slow and hard work.

What the numbers say

Gem Mine is a resource building in the Builder Base. It is unlocked at Builder Hall 3 and upgradeable through 10 levels. It occupies 3x3 tiles.

Across those levels it gains hitpoints from 300 to 1,150.

Taking one from level 1 to 10 costs 19,490,000 Builder Elixir in total, and 22 days 5 hours of build time.

How it looks at each level

Stats by level

Gem Mine stats by level

Level	Hitpoints	DPS or effect	Build cost	Build time	Builder Hall
1	300	—	120,000 Builder Elixir	1 h	3
2	350	—	180,000 Builder Elixir	2 h	3
3	400	—	240,000 Builder Elixir	6 h	3
4	460	—	450,000 Builder Elixir	8 h	4
5	550	—	1,000,000 Builder Elixir	12 h	5
6	650	—	1,500,000 Builder Elixir	1 d	6
7	750	—	2,500,000 Builder Elixir	2 d	7
8	850	—	3,500,000 Builder Elixir	4 d	8
9	1,000	—	4,500,000 Builder Elixir	6 d	9
10	1,150	—	5,500,000 Builder Elixir	8 d	10

Where these numbers come from. Read from Clash of Clans' own game files, client build 18.600.3. They are exact for that build and do not reflect anything released after it, so verify in game before committing an upgrade.

Game values are read from Supercell's own game files, reproduced as fan content under Supercell's Fan Content Policy. Goblins Farm is not affiliated with, endorsed, sponsored, or specifically approved by Supercell, and Supercell is not responsible for it.

Keep reading

Gold Mine Elixir Storage Gold Storage Builder Base

Goblins Farm is not affiliated with, endorsed by, sponsored by, or specifically approved by Supercell. Clash of Clans is a trademark of Supercell Oy. This material is unofficial fan content produced under Supercell's Fan Content Policy. Game values change with every update; always verify in-game before committing an upgrade.