Citrine Cathedrals
There is only one specific region of Brazil that produces Citrine geodes in these unique cathedral shapes. Much of the Citrine in circulation today including these items and other Citrines from Brazil, were originally Amethysts that have been heated in kilns, which mimics and speeds up the naturally occurring process that geo-thermal heat hadn't yet had a chance to do which is to give these gemstones their beautiful range of amber colors.
These are a matching pair, which mean that they fit together as one.