Emerald – Natural, Faceted, Green

Emeralds almost always have inclusions. Some oil treatments try to make an emerald's jardin (or "garden") of inclusions more visually pleasing. Oil treatments are also used to enhance color. Emerald ring, photo by Mauro Cateb. Licensed under CC By 2.0

Article: How to Re-Oil Emeralds Safely and Easily

Credit: Mauro Cateb