Jewels

Jewels are among the rarest and most useful items in MU Online. In the game's story, each one is a shard of the sealing stone that once held Kundun before it broke apart. There are seven main jewels: Chaos, Bless, Soul, Life and Creation, plus Guardian and Harmony.

Because they drop rarely, players use jewels as a kind of currency when trading items with each other.

Icon	Jewel	What it does	Success
	Jewel of Bless	Upgrades items up to +6	100%, never fails
	Jewel of Soul	Upgrades items from +0 to +9. On failure up to +7 the item loses 1 level; at +8 and +9 it falls to +0	50% (75% with Luck)
	Jewel of Chaos	The most common jewel; used in item combinations at the Chaos Goblin	Depends on the recipe

The full rules for each level are in Item Upgrade (+1 to +15), and the combinations that use Jewel of Chaos are in Chaos Machine.

The harmony option and the refining stones were reworked in Season 16; see Jewel of Harmony. Jewel of Creation and sockets are covered in Socket System & Seed Spheres, Jewel of Guardian's castle use in Castle Siege, and pet revival in Pets & Mounts.

In older seasons Bless and Soul could be packed into bundles of 10 and 30 for trading and some combinations. Season 14 replaced that with real stacking:

• Jewels stack and unstack right in the inventory, with no Zen cost, up to 50 per stack. New jewels stack by themselves when picked up.
• Most content takes jewels straight from a stack. A few recipes, such as making a Lapidary Stone, still want an exact number.
• The old jewel bundles can no longer be used.