Gems with phenomena, such as alexandrite and garnet, exhibit different
colors under different lighting conditions. A synthetic diamond has joined
the color-change corps
When seen under incandescent light, some synthetic diamonds from Ultimate
Created Diamonds, Boulder, CO, appear to be a different color than when
they are seen in daylight.
Created Diamonds recently submitted one of these alexandrite-like diamonds
(with color change visible in incandescent and daylight) to the Gemological
Institute of America for study. This product, still grown experimentally,
is a true collector's item color-change diamonds are not known to
exist in nature. This gem was shown for the first time at the Tucson gem
and mineral shows in February, and Ultimate Created Diamonds President Alex
Grizenko expects to market more of them in the future. The "alexandrite
effect" should not be confused with "chameleon" diamonds
whose color change is temporarily induced by heat and is caused by different
chemical and optical characteristics.
This new synthetic variety owes its phenomena to the same optical properties
that allow viewers to see color changes in alexandrites and certain garnets
and sapphires, says Ilene Reinitz, a scientist at the GIA-Gem Trade Laboratory
in New York City. Because of the unique selective absorption of these synthetic
diamonds, greenish yellow is evident in the face- up position in daylight,
and yellowish orange is visible in incandescent light. For more information
about these color-change diamonds, contact Alex Grizenko at Ultimate Created
Diamond Co., Golden, CO; (303) 526-0221, fa: (303) 526-0763.
|This color-change synthetic diamond is a collector's stone because there
is no equivalent in nature. Above is the diamond as it appears in incandescent
light; below is the daylight equivalent. Please note the color change could
not be reproduced on film. GIA's Gem Trade Laboratory obtained the Munsell
color coordinates for the diamond and supplied Professional Jeweler with
information about the colors observed. The photos were retouched to show
the observed color change. Synthetic diamond courtesy of Ultimate Created
Diamonds, Boulder, CO. |
by Robert Weldon, G.G.
Copyright © 1999 by Bond Communications.