beautiful lemon yellow color

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

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

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Blue Tourmaline

Rubino grezzo 14,90 ct Opale beautiful lemon 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