Emerald Tablets
A text purporting to reveal the secret of the primordial substance and its transmutations. It claims to be the work of Hermes Trismegistus ("Hermes the Thrice-Greatest"), a legendary Hellenistic[1]combination of the Greek god Hermes and the Egyptian god Thoth.[2]

This short and cryptic text was highly regarded by European alchemists as the foundation of their art, in particular of its Hermetic tradition. -Wikipedia



Emerald in Different Cultures and Emerald Lore
Emerald is regarded as the traditional birthstone for May, as well as the traditional gemstone for theastrological signs of Taurus, Cancer and sometimes Gemini. One of the more quaint anecdotes on emeralds was by the 16th-century historian Brantôme, who referred to the many impressive emeralds the Spanish under Cortez had brought back to Europe from Latin America. On one of Cortez's most notable emeralds he had the text engraved Inter Natos Mulierum non sur-rexit mayor ("Among those born of woman there hath not arisen a greater"; Man. XI, 11) which referred to John the Baptist. Brantôme considered engraving such a beautiful and simple product of nature sacrilegious and considered this act the cause for Cortez's loss of an extremely precious pearl (to which he dedicated a work A beautiful and incomparable pearl) and even for the death of King Charles IX of France who died soon after.[17]


In some cultures, the emerald is the traditional gift for the 55th wedding anniversary. It is also used as a 20th and 35th wedding anniversary stone.


The Authorized King James Version of the Bible, in Exodus 28:18 and 39:11, lists "emerald" as one of the precious stones in the breastplate of the high priest of the Jews; but modern consensus is that this is probably a mistranslation. (See Hoshen.)


Ireland is often referred to, especially in America, as the "Emerald Isle".[18]


In L. Frank Baum's The Wonderful Wizard of Oz, the city where the wizard rules is made of emerald and is called the Emerald City. The sixth book in the series is named after it. - Wikipedia



Emerald Etymology
The word "Emerald" is derived (via Old French: Esmeraude and Middle English: Emeraude), from Vulgar Latin: Esmaralda/Esmaraldus, a variant of Latin Smaragdus, which originated in Greek: σμάραγδος (smaragdos; "green gem"); its original source being either the Hebrew word אזמרגד izmargad meaning "emerald" or "green"[3] or the Sanskrit word मरग्दम् marakata meaning "green." The name could also be related to the Semitic word baraq (בָּרָק ;البُراق‎; "lightning" or "shine") (cf. Hebrew: ברקת bareqeth and Arabic: برق barq "lightning"). It is the same source for the names Persian (زمرّد zomorrod), Turkish (zümrüt), Sanskrit (मरग्दम् maragdam),Georgian (ზურმუხტი; zurmukhti), Russian (изумруд; izumrud)[4] and Armenian zmruxt. - Wikipedia