Hi,
i found this post…
the coating of boric acid protects the surface of the diamond from
oxygen not heat. It is the oxygen that is the cause of the daimond
"burning". Think of how the boric acid dip keeps your gold from
turning black during soldering. Again it is not he heat but the
introduction of oxygen to the unprotected surface that turns the
metal black, same with a diamond.
and the one below isnt exactly what you are talking about…frosting…but i thought i would add…
I seem to recall, in the back of my brain, something about needing to make sure the diamonds were clean before any heating, or they would get…some kinda burned-on…discoloration…that is / hard/impossible to remove…
anyone know if my brain is recalling correctly?…
edit- i found this older post
I recently soldered new posts on a pair of diamond earrings with the
stones in place and they turned quite yellow. What caused this and
how can the problem be corrected?
Here’s one possibility: If a diamond is dirty when it is subjected
to heat, the dirt can burn into the surface of the stone causing
permanent discoloration or black marks that look like inclusions. If
this is the cause, the only solution is to repolish the stones. When
soldering diamonds in place, always thoroughly c…
and this one…on an interesting, kinda related note…
ruby sapphire diamond only. I've seen people solder on some
garnets but I won't.
There are caveats to heating those stones too. Diamonds that have
been “enhanced” by means of laser drilling and filling with glass
should not be heated. It won’t destroy the diamond, but the glass
filling can ooze out or at least discolor. I hesitate to heat any
diamond that is heavily included too. And there’s a certain kind of
glass filled ruby that you can’t heat either. p Corundum cabachons
shouldn’t …
ganoksin archives are priceless!
julie
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