Prefixes

If you place a jewel in the Jewels slot of the Forging Interface, a prefix will be added to your item. If you want a stronger prefix, you can place five of the same jewel type in the slot, or, if you want to go even further, you can craft a Large Jewel from 15 Jewels, and put it in the slot.

Diamond
Adding 1 Diamond to the slot will result in the prefix "Light", which increases the weapons speed by 20%, at the cost of lowering the damage by 10%.

Adding 5 Diamonds will result in the prefix "Swift", which increases the weapons speed by 20%.

Adding a Large Diamond will result in the prefix "Flowing", which increases the weapons speed by 20%, the damage by 15%, and the size by 5%.

Ruby
Adding 1 Ruby to the slot will result in the prefix "Knightly", which increases the weapons damage by 12%, at the cost of 10% knockback and 4% critical strike chance.

Adding 5 Rubies will result in the prefix "Royal", which increases the weapons damage by 15%.

Adding a Large Ruby will result in the prefix "Godly", which increases the weapons damage by 20%, the knockback by 10%, critical strike chance by 5% and the size by 10%. If the item is a tool, the range increases by 1, instead of the size increase.

Emerald
Adding 1 Emerald to the slot will result in the prefix "Large", which increases the weapons size by 10%, or if it is a tool, the range increases by 1.

Adding 5 Emeralds will result in the prefix "Massive", which increases the weapons size by 15%, or if it is a tool, the range increases by 2.

Adding a Large Emerald will result in the prefix "Enormous", which increases the weapons size by 20%, or if it is a tool, the range increases by 3.

Sapphire
Adding 1 Sapphire to the slot will result in the prefix "Zealous", which increases the critical strike chance by 7%, at the cost of 5% knockback.

Adding 5 Sapphires will result in the prefix "Keen", which increases the critical strike chance by 10%.

Adding a Large Sapphire will result in the prefix "Superior", which increases the critical strike chance by 14%, the damage by 10%, the knockback by 5% and the size by 5%.

Topaz
Adding 1 Topaz to the slot will result in the prefix "Heavy", which increases the knockback by 20%, at the cost of 10% speed.

Adding 5 Topazes will result in the prefix "Forceful", which increases the knockback by 20%.

Adding a Large Topaz will result in the prefix "Savage", which increases the damage by 10%, the knockback by 20% and the size by 15%. If it is a tool, the range increases by 2 instead of the size increase.

Amethyst
Adding 1 Amethyst to the slot will result in the prefix "Brutal", which increases the damage by 15%, at the cost of 10% speed.

Adding 5 Amethysts will result in the prefix "Sinister", which increases the damage by 15%.

Adding a Large Amethyst will result in the prefix "Demonic", which increases the damage by 15% and the critical strike chance by 7%.