As a consequence, unlike diamonds, emeralds
do not have purity indexes. In contrast to colored resin injection, which denatures the
stone, impregnation in fine oils is a legal technique that is often used to intensify the
color or mask a portion of the inclusions. (For more information on cedarwood oil, please
see our article
www.gem-matrix.com/cedarwoodandemeralds.).
If you want an emerald from Colombia's Muzo mine, you must request a
certificate: this mine only produces about 50 jewelry emeralds per week. These are extremely
pure and in high demand.