What a coincidence…we"ve both been in the business exactly the
same amount of time ! Furthermore, we have both learned not to
warrant Opals or Emeralds. One little trick that I have learned in
checking out Opals is helpful, however. Hold the opal up to the edge
of an incandescent light and view the stone through indirect light (
the light bulb must be shaded by a hood ) This will enable you to see
the fractures, if there are any. The same technique is used to
evaluate facet rough.
Also, when it comes to caution about stone setting and warranties, I
will never warrant the setting of a diamond except in a six or more
pronged head. I am also very cautious about star Sapphires…they are
much more prone to fracturing than other Sapphires. Peridots are a
pain in the rear from the standpoint of wear. Knife edge girdles on
all stones are trouble. I could go on , but the work ethic calls…
Ron at Mills Gem, Los Osos, CA.