Pristine

is a Mining stat which increases the chance to drop higher quality gems from mining.

Mechanics
Each point of grants a 1% chance to drop a  Gemstone per  Gemstone mined.

The effect of activates on each  Gemstone harvested before  is applied. applies on the Gemstones  gives. For example, if a player with 10 and 500  mines Ruby, which drops, they will have 3-6 chances of 10% to get.

Expected Drop Calculation
The expected drop can be calculated by: $$ \begin{align} Expected Drop &= Base Drop * ( 1 + Pristine * 0.79 ) * ( 1 + Mining Fortune / 100 ) \end{align} $$

Increasing Pristine
The Enchantment increases  by 1 per level, up to 5.

Topaz Gemstones can be applied to certain items to give them.

is not affected by the stat boosts from, Superior Dragon Armor or the Ender Dragon Pet, though is affected by the Bal Pet. Extra blocks mined by the Efficient Miner perk cannot activate.

is affected by Dungeon Boosts and applying any Topaz Gemstone to compatible Dungeon Armor or Dungeon Weapons will treat it just like most other stats and boost your based on your Catacombs Level.

While this feature as of now can't be effectively used (since mineable Gemstones currently do not generate as part of any Dungeon) it is still worth mentioning it, since other stats like  or  aren't affected by Dungeon Boosts at all.

Maximum
Outside of dungeons, the highest currently obtainable is 18.63.

This is obtained by holding a recombobulated Divan's Drill, Titanium Drill DR-X655, or Gemstone Gauntlet enchanted with Pristine V and a Perfect Topaz Gemstone applied, wearing armor with Perfect Topaz Gemstones, having an Artifact of Power with a Perfect Topaz Gemstone, with a level 100 Bal Pet equipped while in the Magma Fields.