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124 THE CURIOUS LORE OF PRECIOUS STONES
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Many engraved stones of the Roman imperial period bore the figures of Serapis and of Isis, the former signifying Time and the latter Earth. On other stones the symbols of the zodiacal signs appear, referring to the natal constellation of the wearer. The astrologers, who derived their lore from the Orient, were consulted by all classes of the Roman people, and it is therefore very
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natural that the signet, or the ring worn as an amulet, should frequently have been engraved with astrological symbols. These designs were usually engraved on onyxes, carnelians, and similar stones, in Greek and Roman times; but occasionally the emerald was used in this way, and more rarely the ruby or the sapphire. Here the costliness of the material was probably thought to en-
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