Emeralds are beautiful green stones that belong to the Beryl species. They possess some wonderful yet contradictory qualities of being hard and brittle at the same time. – House of Devam
How Emeralds Form | 3 Unique Ways! - YouTube
Everything You Need to Know About Emerald
Emerald | Multicolour.com
Emerald Chemistry and Geology - A Guide to Beryl Crystals | The Natural Emerald Company
Emerald | Birthstones | Gems | Geology & Soils | Online Resources | School of Natural Resources | University of Nebraska–Lincol