Moissanite addenda

Hello All,

An important omission from my earlier post on polishing this
stuff is the reaction of the stone to heat. There is a quite
dramatic colour change effect. This takes place at fairly low
temperatures. It seems to start at about normal dopping
temperature as a light brown then changes to a quite brilliant
yellow colour, returning to the original colour upon cooling.

An alcohol lamp or cigarette lighter make for a quick cheap
tester as this seems to be a characteristic. Any soot easily
washes off.

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ICQ# 15173706

Ooooh! Very good point Tony! I have heated them a number of
times and I would call the color of a hot moissanite a yellowish
green. Very pronounced! For those that don’t know how to look
for double refraction, this could be a pretty good test. I
retipped an old mounting to accept a synthetic moissanite a day
or two ago, but I didn’t find a any flux etching as I think that
you posted earlier. This is not the first time that I have
retipped one. I have never noted any flux etching. Your post
made me double check. What kind of flux were you using?

Bruce D. Holmgrain
Maryland’s first JA certified Master Bench Jeweler

Hello Bruce, I didn’t put the flux on the stone. I am a coloured
stone cutter and received this job via a local diamond cutter.
The job was originally taken in as a 'diamond ring retipping’
when the damage occured and the stone was sent out for repair. I
assumed the damage was flux from the job description and 15x
inspection revealed identical rings and etching/fusing patterns
similar to those I have seen on flux damaged sapphires. The
little black dots however were new to me. Rather than research
and experiment I would suggest just keeping the stone clean when
heating. Maybe the C3 people could provide answers?


I have probably set fifty or so of these things. A good number
(1/3 - 1/2?) in platinum. Some of these designer settings have
even required the stones to be soldered in. So far no cracks. I
have managed to chip one and a client has managed to crush one.
C3 replaced the one that the client crushed. As I said before, I
haven’t seen flux etching. I surely haven’t seen these black
specks. Perhaps someone tried to retip platinum with the stone
in? I use batterns flux and sometimes boric acid to check
oxidation myself.

If I can think of it, I may call C3 tomorrow. 

Bruce D. Holmgrain
Maryland’s first JA certified Master Bench Jeweler