Those are special stones which can be bought on Box Arena.
Cosmo Stones
Infinity Stones are powerful gem items that can be socketed into equipment. Each stone comes in three tiers — naturally, higher tiers are rarer and more expensive, but offer significantly stronger effects.
Tier
Rarity
Power Level
Impure
Very Rare
Weak imitation — only a fraction of the original's power
Clone
Epic
Strong imitation — nearly matches the real thing
Real
Legendary
Full power of the original stone
Soul Stone
Binds your item to your soul, protecting it on death.
Tier
Soulbound Level
Soulbinding Chance
Impure Soul Stone
1
35%
Clone of Soul Stone
2
65%
Soul Stone
3
90%
Power Stone
Reduces the chance of your item breaking on death.
Tier
Soulbound Level
Break Protection Chance
Impure Power Stone
1
30%
Clone of Power Stone
2
40%
Power Stone
3
50%
Time Stone
Repairs your item when used.
Tier
Effect
Impure Time Stone
Restores a flat 2000 durability
Clone of Time Stone
Restores ~50% durability
Time Stone
Restores ~80% durability
Reality Stone
Unsockets gems from your equipment.
Tier
Unsocket Power
Impure Reality Stone
1
Clone of Reality Stone
2
Reality Stone
3
Mind Stone (Legendary)
Used to identify unidentified items. No Impure or Clone variants exist.
Space Stone (Legendary)
Used to remove skins from items. No Impure or Clone variants exist.
