Introduction[ | ]
Some cards have sockets. If you insert a gem in the socket and pay for the gem's costs, then you get the gem's benefits. For example, Rotting Knight is a 2/1 zombie that costs ③ resources and has 
thresholds. If you insert a white gem and you have a white threshold, then it becomes a 2/3 zombie. But if you insert a red gem and have a red threshold, then it becomes a 2/1 zombie with [Swiftstrike]. So you can customize socketable cards however you like.
You can find a complete list of socketable cards at Hex TCG browser and Hex card search engine.
Gems[ | ]
There are currently 20 gems in standard format. They rotate every 2 seasons.
 Blood |
 Diamond |
 Ruby |
 Sapphire |
 Wild | |
|---|---|---|---|---|---|
| Minor | : [Speed]
|
 : +2
|
 : [Deploy] - Create a valor and put it into your hand.
|
 : [Basic] [1-shot]  → Summon 2 dreadlings.
|
 : [Crush] and +1 .
|
| Minor | : This can't be blocked by troops with less than this troop's .
|
: When this attacks, it gets [Flight] this turn.
|
: [Swiftstrike]
|
: When you play an action, this gets +1/+1 this turn.
|
: [Skyguard] and [Steadfast]
|
| Major | : [Deploy] - You may sacrifice a troop. If you do, this gets +3/+3.
|
: When you draw this, it gets - this turn.
|
: [Double damage]
|
: [Deploy] - Create a random action with cost equal to or less than this card's cost that you meet the threshold requirements to play and put it into your hand.
|
: [Deploy] - Create a random troop with cost equal to or less than this card's cost that you meet the threshold requirements to play and put it into your hand.
|
| Major | : When this attacks, underworld troops you control get +1/+1 and [Lethal] this turn.
|
: When this attacks, ready each ardent troop you control. They get +1/+1 this turn.
|
: When this attacks, draw a card. That card gets "At the end of your turn, if this is in your hand, discard this" this turn.
|
: When this attacks, target opposing troop gets - equal to this troop's until the start of your next turn.
|
: When this attacks, gain [1/1].
|
Rules[ | ]
For both PvP and PvE:
- You cannot use more than 4 copies of each gems per deck.
- You can insert major gems in minor sockets, but not vice versa.
- If you don't pay the gem's costs, then you won't get the gem's benefits, but you can still play the card normally.
- If you create a socketable card in battle, then it will have a random gem with your threshold.
For PvP:
- You can change gems between rounds like you change reserved cards.
For PvE:
- Some computers use different gems than we do.