In Vikings War of Clans gems are used to enhance power on the hero gear. Each gear has space for three gems giving additional power or speed. You can obtain these gems from invaders and you can fuse them for higher level legendary gems with maximum benefit. New gems were introduced with Uber Invaders which are also listed below, these gems are only available through attacking Uber Invaders. Gems are stored in Building Workshop where you can not only fuse them for better quality but also inlay them in your hero gear.
Gems also come in six different classes: Simple, Usual, Unusual, Rare, Epic, Legendary. You need four of the same kind to fuse them to the next level. Legendary is the biggest and the strongest. Most gems have a maximum of 10% or 12% in legendary with exception of a few.
Whether you are building a hero gear set for production, farming or attacking or defense gems, specially legendary gems add a great percentage of power. And it is important to remember that you as a new player you should not fuse all the way and have few legendary where if you can manage 1 legendary you might get a 10% benefit but four epic will give you 4 x 8% = 32% so only fuse to legendary when you have enough to do so for all your available gears.
You can change gems in your gear as long as you have Diamond knives you can switch them if not you will be paying by gold for diamond knives. So doing a bit of planning will save you some gold. Each level has a different Diamond knife and the price also goes up with the levels. You do receive some of the diamond knives as a prize when you attack invaders however usually it is the lower levels given out. You can also crush the gem and put a new one in and that won’t require the Diamond Knife however you lose the gem only do this when you have a lot of extra ones or if you absolutely no need again for that gem.
Each piece of gear accommodates three gems but you cannot repeat the same gem twice in the same gear but just one of each. There is a fourth space but it seems to be for a future upgrade.
|Gem||Benefit||Invader / Uber Invader||Maximum|
|Agate||Siege Offense||Celt, Gepid, Lynx, Wild Boar, Royal Guardsman||10%|
|Alexandrite||Stone Production||Canis, Longobard, Canis, Man-Eater, Khazar, Celt, Royal Guardsman||10%|
|Amber||March Speed||Canis, Khazar, Serpent, Northen Vulture||7%|
|Amethyst||Lumber Production||Man-Eater, Hun, Avarin||10%|
|Beryl||Troop Capacity||Barbarian, Hun, Cave Lion, Gascon, Royal Guardsman, Northen Vulture||7%|
|Emerald||Hero Energy Regeneration||Canis, Gepid, Gascon, Hounds, Hun, Khazar, Wild Boar, Northen Vulture, Lynx||3%|
|Garnet||Scout Offense||Lynx, Serpent, Longobard||10%|
|Jacinth||Killer Offense||Man-Eater, Hounds, Avarin||10%|
|Jasper||Silver Production||Avarin, Gascon, Man-Eater, Hounds, Wild Boar, Saracen||10%|
|Lazurite||Iron Production||Gepid, Barbarian, Cave Lion, Serpent, Wild Boar, Saracen||10%|
|Opal||Cavalry Offense||Pict, Barbarian, Cave Lion, Saracen, Wild Boar||10%|
|Peridot||Hero Energy Capacity||Pict, Barbarian, Canis, Man-Eater, Khazar, Cave Lion, Saracen||250|
|Rhodonite||Melee Offense||Gepid, Hun, Celt, Royal Guardsman,||10%|
|Ruby||Total Health||Pict, Canis, Gascon, Khazar, Lynx, Hounds, Hun, Northen Vulture, Serpent||10%|
|Sapphire||Food Production||Pict, Barbarian, Man-Eater, Northern Vulture||10%|
|Spinel||Ranged Offense||Canis, Khazar, Hounds, Northern Vulture, Longobard||10%|
|Topaz||Resource Yield Speed||Longobard, Gascon Barbarian, Hounds, Cave Lion, Serpent, Lynx, Saracen||7%|
|Tourmaline||Troop Defense||Avarin, Barbarian, Cave Lion, Celt, Hounds, Saracen, Royal Guardsman||10%|
New Vikings Gems introduced in 2017 and only available through Uber Invaders
|Rose Quartz||Killer Health||Pict||12%|
|Smoky Quartz||Melee Defense||Avarin||12%|
|Taffeite||All Troop Offense||Avarin||10%|