A giant gem-covered crab for AFK combat training. It never dies; after 10 minutes it burrows and the top 16 players mine its shell for gems.
A giant crab from the Tlati Rainforest, covered in gems. It is built for AFK combat training: it has every stat at 1, hits for at most 1 and can never be killed. Its health bar is a timer - after about 10 minutes it burrows away and leaves its shell behind.
| Getting there | The teleport menu (Skilling > Gemstone Crab, 2,500 coins). The cave in the mine takes you home. |
| Combat level | 160, size 5x5 |
| Its attacks | Max hit 1 every 7 ticks |
When the crab burrows, its shell stays for 90 seconds. The top 16 players by damage can Mine it once with any pickaxe for three uncut gems. The top three damage dealers are named as the top crab crushers (only the top one when fewer than five fought). The crab resurfaces a few seconds after the shell is gone.
| Gem | Chance per gem |
|---|---|
| Uncut opal | 9/32 |
| Uncut jade | 9/32 |
| Uncut red topaz | 6/32 |
| Uncut sapphire | 3/32 |
| Uncut emerald | 2/32 |
| Uncut ruby | 2/32 |
| Uncut diamond | 1/32 |
| Uncut dragonstone | 1/500 |