LL
the above stones are properly corundums, being identical in every
particular but that of colour, which difference may be said to be the
only cause of a change in the nameĀ· The red sapphire is a ruby, the
blue ruby a sapphire, the yellow a topaz, etc. The name corundum itself
is of Indian origin, derived from the Sanskrit korund, and is
applied only to the opaque massive varieties, which, however, preĀsent
the characteristic hexagonal crystal, and are generally of a dull
colour. The first European to class all the varie-