Dear Lee and All,
It does not really matter what, where, or to who Gerry’s comments
What does matter though is that dubious does not go
uncontested on this public educational forum.
Gerry and some others here would have us believe or suspect- “ALL
GEMSTONES ARE TREATED”.
This is not true, and with a little knowledge one should not even be
suspicious of many gems.
Buying rough gem materials and mineral specimens for many years has
given me some knowledge in this area. However, you do not need to be
a rough buyer to have this knowledge as it is not secret, just of
more interest and availability to gem cutters and mineral dealers.
As I stated in previous posts (many times) I have numerous gems that
are not treated at all in any way. How do I know this? I was not
there when they were dug up, nor did I have my eye on them for the
entire time. So how do I know this? How do I (or you) know anything?
As stated befoRe: Knowledge equals Properly Justified True Belief
The above are not just fancy words but an analysis of what knowledge
is. Knowledge is distinct from opinion, conjecture, or prejudice.
Nobody, none of you can prove everything you know.
In the words of John Locke - “He that, in ordinary affairs of life,
would admit of nothing but direct plain demonstration would be sure
of nothing in this world but of perishing quickly.”
Personally, I know and believe many things which I did not
personally witness. Contact with minerals, rough gems, knowledgeable
people, actual mines, written materials, museums and more have given
me a foundation of knowledge in this department.
There are many gems for which it is well known there are no
treatments. So why suspect them? Then there are many gems which
could be treated but usually are not. You will have to evaluated the
circumstances in this case and come to a properly justified true
belief in these cases. If you do not have the knowledge, it pays
to know a reputable knowledgeable dealer or person you can trust.
And then there is the distinction made in a recent post of mine
between the high tech treatments (radiation and ultra high temps and
diffusion to change color) and the low tech treatments (heat
treatment in the range of normal kilns >700 C). In my opinion this
is an important distinction and all gem treatments should not be
lumped together. Some are considerably more insidious than others
IMO (i.e. bulk diffusion in sapphires, recent diffusion in topaz,
colored dyes, irradiation, and high temp corundum treatments).
The following are stones I have in my inventory that are not
treated: (Remember I buy all my materials in the rough.)
amber from Chiapas, chrome beryl, chrysoberyl, moonstone,
labradorite, sunstone, almandine, spessartite, grossularite,
andradite, iolite, nephrite, lapis-lazuli, opal, peridot, rock
crystal, red and gold rutilated quartz, quartz with edenite needles,
strawberry quartz, rose quartz, amethyst from
from Mozambique, smoky quartz from Colorado, chrysoprase,
chrysocolla, blue chalcedony, carnelian, Montana agate, sphene,
spinel, turquoise, tourmaline-most of mine are not heated, imperial
topaz from Ouro Preto, cassiterite, datolite, rhodocrosite,
rhodolite, demantoid form my old mine in Veracruz, yellow apatite,
fire agate, most of my aquas and green beryls, phenakite, danburite,
scheelite, clinohumite, all colors & locales of my tourmalines
(except some of the browns from Nigeria), sphalerite, ametrine,
black jade from Wyoming, charoite, sugilite, morganite, green Mali
garnet, tsavorite, hessonite, Maw Sit Sit, holly blue chalcedony,
moldavite, pink opal, rhodonite, Transvaal jade (hydrogrossular
I also have heat treated materials:
Some tourmalines, some smokies, some aquas, all blue zircon,
tanzanite, some citrines
And irradiated materials:
blue topaz, lemon citrine, “root-beer” topaz
Some questionable: Heliodor
I do not carry many corundums (ruby & sapphire), but the general
feeling in the industry nowadays is that they are all treated with
high heat, diffusion or both. Of course there are some natural gems
Nor do I have many emeralds which are usually well oiled under very
high pressure. Sometime even with colored oil.
So now that I have stated my position on the gem treatment issues
for the umpteenth time and listed my natural gem inventory, I will
let this comatose horse lie for awhile.
Steve Green / Rough and Ready Gems (Tired of talking about gem
treatments, I think I’ll take a long ride on my motorbike.)