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Emerald is of a fine green Colour, (of 

 all the different Shades from the deepeft 

 to the paleft) occafioned by fome neigh- 

 bouring Iron and Copper Mines. This 

 Stone lofes its Colour in Fire, and is then 

 undiftinguiiliable from a white Sapphire. 

 The genuine oriental Emerald is a very 

 hard and moft beautiful Gem, but few 

 of them have of late been brought to 

 Europe^ that which the Jewellers call ori- 

 ental, being the Produce of America ; 

 and what is ufually fold under the Name 

 of occidental Emerald is nothing but 

 tinged Cryflal. The Emerald is fome- 

 ti'mes found in a Pebble-like Form, but 

 more frequently in a columnar or angu- 

 lar one, like Cryftal. The oriental Eme- 

 rald is of the Hardnefs of the Sapphire, 

 or Ruby, and fecond only to the Dia- 

 mond in Luftre and Value. The Ame~ 

 rkan is of the Hardnefs of the Garnet, 

 and the European fofter than that, but 

 much harder than Cryftal. The Pebble 

 Emeralds are found loofe in the Earth, 



often 



