These are two crystals with slight inclusions and traces of matrix

Some natural inclusions visible to the naked eye

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Its pleochroism is marked

Blue Tourmaline

Rubino grezzo 14,90 ct Opale These are two crystals withThe gem appears included when observed with a 10 magnifying glass. The glassy appearance of its surface is caused by the heating treatment in the presence of fluxing materials, such as borax, in which the rough stones are immersed. These fluxes allow the recrystallization and internal fractures of the ruby, but having a lower melting point than the gem, they dissolve to form a glassy patina that remains on the surface of the rough stone and that will