Most minerals contain visible traces of their genesis - perhaps tiny
crystals of other minerals that were caught up in the growth of the
larger host crystal, or formed simultaneously as it grew, internal
fractures that have been partially healed during growth, or traces of
earlier growth stages, marked by zoning. Gemologists use the word
inclusions to describe these and other internal phenomena.
Inclusions in a gemstone, viewed through a microscope or a 10x loupe,
can give information about the geological environment in which the
mineral was formed.
Inclusions can sometimes identify gemstones and they can prove whether the stone is natural or synthetic. Inclusions can also tell us
where a gemstone comes from