I also do not feel comfortable selling some of the gems with
treatments that are on the market but unfortunately most gemstones
are treated in some fashion. There are a few exceptions such as
Peridot, Garnet, Iolite etc.
There is no problem selling lapis treated with Paraffin wax as long
as you disclose it to your clients. I for one do not like to sell
any gemstone treated with paraffin.
As for the difficulty of getting a good polish on Lapis, this
gemstone easily undercuts as you are polishing it. You need to take
your time and use laps that gradually get finer and finer. It is
difficult to try to jump from say a 1200 grit lap right to a final
polish. Try laps that gradually go up to a 50000 grit diamond and
see how that works.
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