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

Un esempio su tutti gli anelli

The gem appears included when observed with a 10x lens: the evidence of lead-glass filling treatment is clearly visible

the prongs had to be ramifications rather than part of a setting

Blue Tourmaline

Rubino grezzo 14,90 ct Opale in cui riunisco quello cheThe 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