I haven't looked closely at black diamonds, but they are diamonds,
and they are, I think, black, and reasonably glittery, so as long
as they are being sold pretty cheap, and used for novelty value or
contrast, I don't see a problem. They do hold up like other
diamonds, don't they? So no one is being deceived...
Noel, the type that Nanz described, with many small black inclusions
will hold up as well as any other diamond. If, however they are
heavily included with feathers (cracks), they definitely won't. And
while they are certainly glittery, they don't have the fire and
visible dispersion that better quality diamonds do.
Here's a case in point: About 2 weeks ago, a woman came to the store
with a small ring she had bought in the islands. The ring had one
center row of small, graduated single cut white diamonds with a row
of graduated, full cut black diamonds on either side. While the
center row was single cut, they still had some nice sparkle and fire.
And while the side rows of brilliant cut black diamonds had no fire
whatsoever, the reflections from the adamantine luster of their
facets was very glittery. Although it was a cheap ring with an
uninspired design, I thought the use of the different facet
arrangement was at least a little clever.
I agree with Noel. As long as no one is being deceived, I have no
problem with their use.
James S. Duncan, G.G.
James in SoFL