Harmony

In order to get the Jewel of Harmony stone, there are 2 ways:

Classic - pass the Kanturu Event and melt Gemstone there in Harmony
Modern-use the convenient Craft Manager in Davias Craft (229 8)

Harmony-options can be added to all weapons, shields, and all parts of sets

    You can only add one option to one item
An item with the option cannot be sold (neither to players nor NPCs), items with the option are automatically assigned to your account
Move things within the account, of course, you can
To get the option you need to insert the Jewel of Harmony in the item
Options are randomly generated

If the Harmony option is GRAYED out, it means that the item level is insufficient for the option to work. You need to improve the level of sharpening of the item (top options work on +13-+15)

In order to improve the Harmony option, you need Refining Stones shards (lower and higher)

In case of unsuccessful use of Refining Stone, the existing option on the item may drop to its minimum value

You can get Refining Stones shards (lower and higher) from the Osbourne NPC in Davias Craft (226 24), or buy or get them for various events

NPC Turns Items into Refining Stones
 Normal Items (+4 and higher) will turn into Lower Refining Stones, while Excellent items will turn into Higher Refining Stones.