Rarity

An item's Rarity is usually a signifier of how common an item is, though it may also show a special quality of an item, such as it being unobtainable. It is shown via the color of the items's name in its tooltip.

Common
Shown with a cyan name, common items are ones that are the most obtainable; these include ores and crops. This rarity has an internal ID of 1.

Uncommon
Shown with an azure name, uncommon items are ones that are less obtainable; these include gems and golden crops. This rarity has an internal ID of 2.

Rare
Shown with a teal name, rare items are ones that are the least obtainable; these include hardite-based items and rare Stickers. This rarity has an internal ID of 3.

Unique
Shown with an orange name, unique items are ones that are unique in some way; these include Christmas items and the Sticker Book. This rarity has an internal ID of 4.

Plot (Bad)
Shown with a name that fades from yellow to red (referred to as "blood yellow"), these items are ones that plot related in a bad way; these include the mystery potions and the Real Knife. This rarity has an internal ID of 5.

Plot (Good)
Shown with a name that fades from yellow to white, these items are ones that are plot related in a good way; the only item that currently has this rarity is the Thunder Staff. This rarity has an internal ID of 6.

Unobtainable
Shown with a gray name, unobtainable items are ones that are completely unobtainable in FS3; no items have this rarity, but several effects do. This rarity has an internal ID of 7.

Moss
Shown with a dark green name, moss items are ones that contain moss in theme; these include the Moss Block and Mossy Cobblestone. This rarity has an internal ID of 8.

Null
Shown with a cyan name, identical to Common, null items are ones that are not items at all; these include Null and the placeholder items. This rarity has an internal ID of 0.