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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'. By definition, emerald is any medium to dark green beryl ...

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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Emerald(エメラルド) @Emerald_info_ Pop music発 BlackMusic経由 Billboard/bluenote行。 ご予約などの連絡はこちらへ → emerald.official.05@gmail.com 2017/10/18 2nd Full Album『Pavlov City』リリース

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.

emeraldinsight.com/loi/info

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

Comments. Emerald is a medium or darker green to blue-green beryl gemstone, in which the green color is derived from impurities of chromium, vanadium, or a combination of both. Before 1963, the definition of emerald was limited to beryls with chromium impurities, but the discovery in Brazil of a large deposit of beryl stones colored green by vanadium led to modification.

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/.../emerald-information

Emerald is a beautiful green gemstone that has been sought after since ancient times. Learn more about this gemstone and browse the beautifully cut stones we have for sale. ... 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 ...

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!

www.gemdat.org/gem-1375.html

The name emerald derives from Greek "smaragdos" - green stone. It is the most precious stone in the beryl group. Its green is incomparable, and is therefore called "emerald green".