This #sapphire from #Elahera (Sri Lanka) contains several large #crystal shaped #cavities (negative crystals). Two of these negative crystals are filled with a liquid and a #gas of unknown composition.
With gentle heating the liquid in both negative crystals begins to boil. The bubbles are formed on the surface of a black crystal, which could be graphite. Simultaneously, the gas quantity decreases more and more until only a homogeneous liquid is present as the gas dissolves in the liquid.

In the left negative crystal the free gas fraction increases with the heat. Presumably, the complete liquid transforms into gas, so that after a few seconds, the liquid completely disappears.

Once the stone cools, the process is reversed until the initial state is regained. In science, the whole effect is used to determine the minimum temperature of the crystal formation.

Apart from the scientific evidence this video is a fine example of the wonders and phenomena that appear in gemstones.




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