Rarities

1. Mundane5Khron ea.
2. Refined20Khron ea.
3. Sublime60Khron ea.
4. Supreme150Khron ea.
5. Celestial400Khron ea.

Mundane

6 items · 5 Khron each · tier 1 gear

• Dawn Valethe common · tracking and digging69%T160%T242%T338%T4

Refined

14 items · 20 Khron each · tier 2 gear

• Dawn Valethe rare · tracking and digging31%T140%T258%T362%T4
• Umbral Forestthe common · tracking and digging69%T160%T242%T338%T4

Sublime

15 items · 60 Khron each · tier 3 gear

• Umbral Forestthe rare · tracking and digging31%T140%T258%T362%T4
• Dunes of Oblivionthe common · tracking and digging69%T160%T242%T338%T4
• Mist Archipelagothe common · digging69%T160%T242%T338%T4

Supreme

21 items · 150 Khron each · tier 4 gear

• Dunes of Oblivionthe rare · tracking and digging31%T140%T258%T362%T4
• Mist Archipelagothe common · tracking69%T160%T242%T338%T4
• Mist Archipelagothe rare · tracking and digging31%T140%T258%T362%T4
• Heart of the Veil

Celestial

10 items · 400 Khron each · no tool carries it

• Heart of the Veilthe rare · tracking and digging31%T140%T258%T362%T4

Percentages are the share of that land's finds that come out at that rarity, by your tool tier (T1 Mundane → T4 Supreme). Taken from the game's own tables.