Hi everyone and especially the gemologists on the list.
I’m in need to some informed comment on a ruby. A local jeweler
friend asked me to look at one for him and see if I could decipher
whether is is synthetic or natural.
The stone is brilliant cut, about 1 carat, stunning color, came from
an old and flimsy ring, and, unusually, has a small flat culet facet.
It fluoresces brilliantly under LW-UV. As you turn it under crossed
polars, it extinguishes dramatically. Nothing patchy or anomalous
about this extinction. Hence not spinel or garnet.
The “flimsy ring” suggests a low value stone. Brilliant fluorescence
under long wave UV suggests synthetic - but only suggests. The flat
culet facet suggests it is (as the owner says) a very old stone.
Under the scope a trail of round bubbles can be seen. Aha!
Definitive: synthetic. But wait a moment. I don’t see curved growth
lines. (That doesn’t mean they’re not there, just I don’t see 'em).
What puzzles me particularly are half a dozen black speck inclusions,
tiny, approximately cube shaped, at random in the stone.
Most of the indicators suggest synthetic, but I’m not aware of
synthetics with black-speck inclusions.
So that’s my question. Have any of you gemologically inclined folks
ever seen black-speck inclusions in a ruby you knew to be synthetic?
Cheers and thanks!