tells us, symbolizes charity.

St.Bruno and St.
Rupert say that the aqua-marine concentrates in its pale green fire all theological science.

There yet remain two gems, the turquoise and the opal.

The former, little esteemed by the mystics, is to promote joy.

As to the second, of which the name does not occur in treatises on gems, it may be identified with chalcedony, which is described as a sort of agate of an opaque quality, dimmed with clouds and flashing fires in the shadows.
"To have done with this emblematical jewelry, we may add that the series of stones serves to symbolize the hierarchies of the angels.