Runes and gems are used in the Workshops to give additional bonus modifiers to your pieces of equipment.
The number of gems/runes that can be added to a piece of equipment is limited by the type and level of the equipment; i.e. you can only get four available slots on Legendary equipment. In addition, you can't add a gem/rune of higher class than the equipment you are adding it to, nor can you add more than one of any gem/rune type to the same piece of equipment.
Gems can be obtained by attacking invaders, completing tasks and yielding resource spots.
| Gem Type | Gem Purpose | Simple | Usual | Unusual | Rare | Epic | Legend. |
|---|---|---|---|---|---|---|---|
| Taaffeite | All Troop Offense | 1% | 2% | 4% | 6% | 8% | 10% |
| Tourmaline | All Troop Defense | 1% | 2% | 4% | 6% | 8% | 10% |
| Ruby | All Troop Health | 1% | 2% | 4% | 6% | 8% | 10% |
| Rhodonite | Melee Offense | 1% | 2% | 4% | 6% | 8% | 10% |
| Smoky Quartz | Melee Defense | 2% | 3% | 5% | 7% | 9% | 12% |
| Spessartine | Melee Health | 2% | 3% | 5% | 7% | 9% | 12% |
| Opal | Cavalry Offense | 1% | 2% | 4% | 6% | 8% | 10% |
| Onyx | Cavalry Defense | 2% | 3% | 5% | 7% | 9% | 12% |
| Almandine | Cavalry Health | 2% | 3% | 5% | 7% | 9% | 12% |
| Spinel | Ranged Offense | 1% | 2% | 4% | 6% | 8% | 10% |
| Aventurine | Ranged Defense | 2% | 3% | 5% | 7% | 9% | 12% |
| Corundum | Ranged Health | 2% | 3% | 5% | 7% | 9% | 12% |
| Jacinth | Killer Offense | 1% | 2% | 4% | 6% | 8% | 10% |
| Pyrope | Killer Defense | 2% | 3% | 5% | 7% | 9% | 12% |
| Rose Quartz | Killer Health | 2% | 3% | 5% | 7% | 9% | 12% |
| Agate | Seige Offense | 1% | 2% | 4% | 6% | 8% | 10% |
| Rubellite | Siege Defense | 2% | 3% | 5% | 7% | 9% | 12% |
| Carnelian | Siege Health | 2% | 3% | 5% | 7% | 9% | 12% |
| Garnet | Scout Offense | 1% | 2% | 4% | 6% | 8% | 10% |
| Morganite | Scout Defense | 2% | 3% | 5% | 7% | 9% | 12% |
| Zircon | Scout Health | 2% | 3% | 5% | 7% | 9% | 12% |
| Aquamarine | Learning Speed | 1% | 2% | 4% | 6% | 8% | 10% |
| Euclase | Training Speed | 1% | 2% | 4% | 6% | 8% | 10% |
| Indicolite | Construction Speed | 1% | 2% | 4% | 6% | 8% | 10% |
| Amber | March Speed | 1% | 2% | 3% | 4% | 5% | 7% |
| Beryl | Troop Capacity | 1% | 2% | 3% | 4% | 5% | 7% |
| Emerald | Hero Energy Regeneration | 1% | 1% | 2% | 2% | 3% | 3% |
| Peridot | Hero Energy Capacity | 35 | 90 | 100 | 150 | 200 | 250 |
| Sapphire | Food Production | 1% | 2% | 4% | 6% | 8% | 10% |
| Amethyst | Lumber Production | 1% | 2% | 4% | 6% | 8% | 10% |
| Lazurite | Iron Production | 1% | 2% | 4% | 6% | 8% | 10% |
| Alexandrite | Stone Production | 1% | 2% | 4% | 6% | 8% | 10% |
| Jasper | Silver Production | 1% | 2% | 4% | 6% | 8% | 10% |
| Topaz | Resource Yield Speed | 1% | 2% | 3% | 4% | 5% | 7% |
Gems drops can be viewed here:[]
NOTE/warning: You can buy Diamond Knifes for removal of a mounted gem - note that this knife can only be used ONCE. Since you are offered to buy a range of knifes, but only from the minimum type of knife up to Legendary Diamond Knife, you get the impression that a more expensive knife would be better - but it is not so. Buying a higher type of knife is just a waste of Gold. Only the lowest possible grade of knife are the one you need and you can only use it once!
The knife level is supposed to determine what the highest level gem is you can safely remove without destroying the gem in the process. So for example if you have applied an unusual gem and wish to save it rather then destroying the gem you need the apropriate level knife. That said im not aware of the lower level knives either working to remove gems or if there is a chance of the gem being saved from the use of lower grade knives. You also have the option of just choosing to destroy the gem which doesnt require a knife.