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www.gemselect.com/gem-info/emerald/emerald-info.php

Emerald Gemstone Information Buy Natural Emerald from GemSelect About Emerald - History and Introduction. Emerald is the most precious stone in the beryl group.The name comes from the old French word 'esmeralde', which was derived from the Greek word 'smaragdos' meaning 'green stone'.

en.wikipedia.org/wiki/Emerald

Emerald is a gemstone and a variety of the mineral beryl (Be 3 Al 2 (SiO 3) 6) colored green by trace amounts of chromium and sometimes vanadium. Beryl has a hardness of 7.5–8 on the Mohs scale. Most emeralds are highly included, so their toughness (resistance to breakage) is classified as generally poor.

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www.mindat.org/min-1375.html

Emerald has priority over beryl as a mineral name. Emerald was known in antiquity and was prized as a gem. In the 1790s, Louis Nicolas Vauquelin, the discoverer of chromium, demonstrated that emerald and beryl were essentially the same chemical compound and that emeralds, sensu strictu, contained chromium. Nonetheless, emerald continued to be listed as the preferred species name for many ...

www.gemrockauctions.com/learn/a-z-of-gemstones/emerald-information

Emerald is on of the most famous gemstones that has been sought after since ancient times. Emeralds, like people, are often beautiful but never flawless, near flawless stones are expensive and extremely rare. Inside an emerald you can find vanadium and chromium, but at it core this gemstone is a variety of beryl, the same mineral as Aquamarine and Morganite.

www.gemsociety.org/article/emerald-jewelry-and-gemstone-information

Emerald Emerald has been synonymous with the color green since ancient times. A fine emerald is a truly breathtaking sight, and this member of the beryl family is well deserving of its placement in the traditional “big four” gems along with sapphire, ruby, and diamond. Emerald is the birthstone for May and for commemorating the 20th and 35th wedding anniversaries.

www.gia.edu/emerald

Gem experts differ on the degree of green that makes one stone an emerald and another stone a less-expensive green beryl. Most gemologists, gemological laboratories, and colored stone dealers call a stone green beryl when its color is “too light” for it to be classified as emerald.

www.minerals.net/gemstone/emerald_gemstone.aspx

Emerald, the green variety of Beryl, is the most famous and valuable green gemstone.Its beautiful green color, combined with durability and rarity, make it one of the most expensive gemstones. Deep green is the most desired color in Emeralds.

www.emerald.com

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gemkids.gia.edu/gem/emerald

Emerald is the green variety of the mineral beryl. (Beryl also includes aquamarine.) There are small amounts of certain atom s that make the emerald bluish-green to green. The age of the oldest emeralds from South Africa is almost 3 billion years old!