This gemstone oiling machine is a compact apparatus to enhance the gemstone beauty. Oil treatment to fill internal fractures is a common practise.
The oiling apparatus is used to induce oil into the surface of a gemstone: the oiling machine "fills" the cracks/ fissures on emeralds and other gemstones to hide imperfections and to increase their beauty.
Thanks to this treatment gemstones gain a uniform colour without any visible cracks.
This device is suitable for treating just cut stones before they are put onto the market or previously oiled gems, in which the oil has dried out in the course of time and consequently they progressively returned to their original appearance.