This is a term applied to stones which are made by using small
chips, powder and ground up low grade stones, binding or fusing
them with a plastic resin (epoxy) and compressing them into blocks.
The blocks are then cut into beads, cabochons,
In some cases, the reconstituted stone is actually made from "real"
or similar stone, but often the reconstituted stones are nothing
more than low grade rocks, like howlite, that have been dyed and
compressed to look like the real gemstone.
Ambroid is a form of reconstituted amber made from real amber pieces,
but is should be
classified as imitation because of the epoxy resin content. It is
made from scraps and shavings of amber that are heated and pressed
into large blocks. Insects found in ambroid are usually fully intact,
without broken body parts, as they were dead when added to the block.
Insects found in real amber
usually have broken wings and legs caused when they tried to escape
from the sticky tree resin.
turquoise is manmade from pulverized pieces of turquoise that are
stabilized and compressed with plastic resins to which dye is added
and should be sold as "simulated" or "imitation"
turquoise. However, this form is often used in much of the mass
produced inlay jewelry.