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. Currently Topaz can be added to Sorrow, Yog, and Divan armor pieces, as well as to the Artifact of Power, which halves the pristine bonus.

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

is affected by both levels and stars within Dungeons. However, there are no Gemstones to mine within Dungeons.

Maximum
Within a Mining island, the highest currently obtainable is 18.63.

This is obtained by holding a recombobulated 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.