X-ray transmission sorter RGS-6 is a diamond recovery machine designed for primary treatment of dry or damp material with size range -100 +6 mm.

The principle of the sorter's operation is based on the property of materials to absorb X-rays. Diamond, consisting of the light element carbon with atomic number 6, absorbs X-rays less than the accompanying minerals containing heavier elements: silicon, calcium, magnesium, oxygen, iron and others.

The sorter consists of a sorting machine (SM) and an automatic control rack (ACR).