I am amazed. Where can I buy a carat of diamond dust for $7.50?
Has anybody tested it out to see what kind of glitter it gives as a
surface coating (eg embedded in plastic)?
First, diamond grit as small as micron size is readily available
from many suppliers at $1.00 per carat or even less, depending on
quantity. This is probably mostly synthetic diamond. 50 years ago the
same grit cost $4.00 per carat, which would be more like $40.00 in
today’s dollars. Huge difference, no?
“Glitter” depends on both surface luster and optical effects of
refraction and reflection from within the stone. Both of these relate
to the Index of Refraction (IR) of the material, also whether the
interaction is taking place in air or in some other substance. If the
imbedding substance has an IR near that of the crystal, the latter
seems to disappear. So imbedding diamond in anything would tend to
diminish any surface luster.
A question has been asked, "what would happen if diamond powder were
imbedded in plastic?
This has actually been done- look at a mylar polishing film. The
diamond just looks grayish or white, just like the diamond powder
itself. A good example of what happens when a high IR is reduced to a
powder may be seen in titanium dioxide used as a pigment. A crystal
of the mineral rutile may be pale yellow to red to nearly black.
Finely ground it is pure white.