Definition of oriental emerald
: a green corundum used as a gem
In a way this is odd, since, unlike rubies and sapphires, today's commercial emeralds are a green-tinted form not of corundum but of beryl, a different mineral entirely. Yet there is a green corundum, too, known commercially as “Oriental emerald,” which was not distinguished from green beryl in antiquity.— ‘Philologos’, The Jewish Daily Forward, 14 May 2004
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“Oriental emerald.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/oriental%20emerald. Accessed 23 Jan. 2022.
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The first known use of oriental emerald was in 1802
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