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256 THE CURIOUS LORE OP PRECIOUS STONES
ments worn by women. The four gods of the lapidaries were looked upon as the discoverers and teachers of the art of cutting precious stones and of piercing and pol­ishing them, as well as of the making of labrets and ear-flaps of obsidian, rock-crystal, or amber. They also were the inventors of necklaces and bracelets.48
The stones worn by Chinese mandarins as a designa­tion of their rank were undoubtedly determined origin­ally by religious or ceremonial considerations. They are as follows ; it will be noticed that red stones are given the preference :
Red or pink tourmaline, ruby (and rubellite)........1st rank.
Coral or an inferior red stone (garnet) ............2d rank.
Blue stone (beryl or lapis-lazuli)..................3d rank.
Rock-crystal ...................................4th rank.
Other white stones..............................5th rank.
The knowledge of classical mythology was so slight among the ecclesiastics of the Middle Ages that some very queer attributions of the subjects engraved on Greek and Roman gems were made during this period. A reliquary containing a tooth of the Apostle Peter, pre­served in the Cathedral of Troyes, was set with antique gems which had been plundered by French and Venetian crusaders from the treasure-house of the Greek Emperor in Constantinople, when that city was sacked in 1204 during the Fourth Crusade. Among these gems was one representing Leda and the Swan—certainly a curious subject for the adornment of a Christian reliquary. An­other Greek or Roman gem, long preserved in a church, was furnished by its Christian owners with an inscription
" Sahagun, " Historia general de las eosas de Nueva Espafia," Mexico, 1829, vol. ii, pp. 389-391, lib. ix, cap. xvii.