Although the golden yellow color is not uniformly distributed

in cui riunisco quello che ho imparato e condiviso con voi seduto nel mio laboratorio

These are two crystals with slight inclusions and traces of matrix

Gem included at 10x loupe and showing signs of heat treatment

Its pleochroism is marked

Rubino grezzo 14,90 ct Opale Although the golden yellow colorThe 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