LAPIDARY ARTS and FACETERS DIGEST
Issue No. 90 - Thursday March 20, 2003
Moderated by: Thurmond Moore III
Committed to carrying on the fine works of
Hale Sweeny and Jerry Dewbre
POST TO EITHER LINK BELOW:
VISIT OUR WEBSITE TODAY
From the Moderator:
Topical Focus for This Week:
GARNET and DARK STONE CLINIC
HOMEWORK for tonight:
For each night this week, put on your thinking caps and share your experiences,
pains and pleasures in cutting Deeply colored Garnet and other Deeply
Consider the following while you compile your responses.
1. Cutting garnet and other stones in the various color saturations
2. Intent: cutting "bright and lively" stones, from rough that reaches
50% saturation (white paper test limit), or darker.
3. How approaching or exceeding the critical angle, or other parameters, might
help accomplish this.
4. Known cuts that perform well in darker garnet rough.
Phil in Florida submitted this topic for the first of a new series of week
long topical "clinics" or group "brainstorming sessions".
Hi all, Our focus topic has be quite active. We still have 1
day's left for this week's topic so get your post in today.
Next week's topic will be Cutting and Polishing Quartzes.
Index to Today's Digest
01 RE: Garnet and Dark Stone Clinic
02 RE: Garnet and Dark Stone Clinic
03 RE: Garnet and Dark Stone Clinic
04 RE: Garnet and Dark Stone Clinic
05 FS: 120g Topaz crystal
06 RE: Graves Faceting machine (SOLD)
Subject: Re:Heat treating Garnets
Date: Wed, 19 Mar 2003 12:01:47 -0800
To: firstname.lastname@example.org (LapidaryArtsDigest)
From: Don Rogers <Don@Campbell-gemstones.com>
At 06:46 PM 3/18/03 -0600, you wrote:
> I've never heard of much heat or other treatment to light garnet. I
>realize they have a poor reputation for heat sensitivity, but perhaps a
>technique could be developed?
I am not sure that the reputation of heat sensitivity is well earned. I
had been of the school of thought that it was fatal to subject a garnet to
the heat of an alcohol lamp and wax. I started quite a discussion on the
Orchard net some months ago on this and as a result, I have since changed
my mind. I received many responses from experienced jewelers that they
routinely re tipped jewelry with garnets without removing the stones. This
is something I would have to think twice about still, but their responses
did make me take another look at the issue. I have been cutting Demantoid
garnets for some months now, and I wax dop using Raytech brown wax, and
then epoxy dop on transfer. I remove the stone by slowly heating the
stone, not the dop, and when it is hot enough the epoxy will release. No
stones damaged to date using this method.
On the heat treating, it has been a given that garnets were the only stone
that had no treatments, including heating. That is no longer a valid
assumption. Pala International introduced a new Russian find of Demantoid
garnets at Tucson this year. In there promotional information, they state
that the stones are heat treated to remove the yellow overtones due to iron
oxide. When talking to them, they told me that they used the same heat
treatment technique that was used for Aqua. IE, a slow heat up to around
600c (1000F) and then a slow cool down. No controlled
atmosphere. Basically the same as cooking Tanzanites. Not all stones
So, there goes another peg that you could hang your hat on. It just proves
that to keep yourself from getting hurt in the colored stone business, you
need to keep yourself educated on what is going on.
Subject: dark garnets
Date: Wed, 19 Mar 2003 21:45:04 -0800
From: "Dale" <email@example.com>
Regarding the dark garnet problem. First let's discuss what we know to
be fact and move on from there.
1) We know that shallow crowns produces brighter gems. This has been
studied and is, at least in my mind, irrefutable.
2) The longer the light path through a stone the darker it will be. If
anyone disagrees with this I will entertain the argument.
Given 1) to be true, we need minimal angles for garnet crowns.
Given 2) to be true, we need minimal angles for garnet pavilions.
Now then, if we have such short light pathways through a given stone
it's going to be rather dull looking. I've done it, there's not much
there. But on the other hand, if there are multiple short pathways
perhaps we may find something for garnet.
Subject: Gemstone saturation
Date: Thu, 20 Mar 2003 08:04:38 -0700
From: "Paul Miller" <firstname.lastname@example.org>
Howdy. How does one determine the "saturation" of a gemstone? Thanx.
Subject: dark garnets
Date: Thu, 20 Mar 2003 10:37:46 -0800
From: "P. Miklik" <email@example.com>
it has been a very long time since i have made a post, but i have been
hanging out in the background. i wanted to say thank you for doing the
dark stone clinic. it is a very helpful topic to me and i do have a
small contribution to make. i started cutting a malaya garnet in a
marquis pattern. it seemed to brighten up the stone, but as i was
polishing the pavillion, the darn thing popped off the dop, so i have
not yet taken time to finish it. i can say that i do actually see light
moving inside of it though.
take care everybody,
Subject: 120g topaz crystal
Date: Thu, 20 Mar 2003 11:06:12 -0800
From: "P. Miklik" <firstname.lastname@example.org>
greetings, thurmond and all,
i just wanted to pass around the word; there is a beautiful, clean,
large, 120g, honey colored topaz speciman available. if anybody is
interested in it, please contact me at my email address and i can give
you digital images and details.
Subject: Graves Sold
Date: Wed, 19 Mar 2003 16:42:44 -0600
To: "LapidaryArtsDigest" <email@example.com>
From: "MR" <firstname.lastname@example.org>
The Graves is sold. It was a Mark 1 it turns out. Sorry for the mix
up. Thanks to all who inquired.
RESOURCES FOR LAPIDARIES:
PERSONALS: (General Lapidary and Faceting)
Lurking is fine, but participation is better for learning !
Post something from your experiences in gemcutting today!
TODAY'S FUNNY ~
If you accidentally over-salt a dish while it's still cooking, drop in a
peeled potato and it will absorb the excess salt for an instant
If you over-salt a dish while you are cooking, that's too bad.
recite with me, The Real Women's motto: "I made it and you will eat it
I don't care how bad it tastes."
Cure for headaches: Take a lime, cut it in half and rub it on your
forehead. The throbbing will go away.
Take a lime, mix it with tequila, etc., chill and drink. You might still
have the headache, but who cares?
Stuff a miniature marshmallow in the bottom of a sugar cone to prevent
Just suck the ice cream out of the bottom of! the cone, for Pete's sake.
are probably lying on the couch, with your feet up, eating it anyway.
To keep potatoes from budding, place an apple in the bag with the
Buy Hungry Jack mashed potato mix and keep it in the pantry for up to a
When a cake recipe calls for flouring the baking pan, use a bit of the
cake mix instead and there won't be any white mess on the outside of the
Go to the bakery. They'll even decorate it for you.
Brush some beaten egg white over pie crust before baking to yield a
beautiful glossy finish.
The Mrs. Smith frozen pie directions do not include brushing egg whites
over the crust, so I just don't do it.
If you have a problem opening jars, try using latex dishwashing gloves.
They give a non slip grip that makes opening jars easy.
Go ask the very cute neighbor to do it.
And finally the most important tip -
Don't throw out all that leftover wine. Freeze into ice cubes for future
use in casseroles and sauces.
REFLECTIONS AND TIDBITS:
A clergyman had just enjoyed a hearty chicken dinner
at the home of a rural parishioner. Gazing out the window,
he remarked: "That rooster seems a mighty proud and happy bird."
"He should," the host replied. "His oldest son just entered the ministry.
From: "RICHARD P ROSENTHAL" <email@example.com>
I am looking for a primary source for rough White Nephrite Jade, close
to point of origin, which is the Ho-Tien[ Hotan] or Yarkand area of
China. Contact Kenaii@earthlink.net I do have Carving and Gem grade
Green Nephrite Jade from Siberia for sale.
Get a FREE copy of the 2003 Faceter's Engagement Calendar
with a $100+ rough purchase at http://www.qualitygemrough.com
(see website for details).
We have recently added some new material, including a new African
find of green/yellow diopside (and we are the only people we know
who have it). Our stock includes things like alexandrite, amethyst,
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kornerupine, sapphire, spinel, tourmaline, zircon and more.
At http://www.qualitygemrough.com you get more value for your
money and we show our appreciation for your business with superior
customer service. You always have a money back guarantee with
the 5-day inspection period, and the convenience of using your
Visa or Mastercard.
Rough to Cut
If you're looking for quality facet rough please check out Rough to Cut,
http://www.roughtocut.com. We offer a wide range of quality facet rough
from Aquamarine to Zircon. Large selections in stock currently of Beryl,
Garnets & Tourmalines. Please check us out & when you do, why not give a
try to our contest, you could win a 5ct + piece of Spessartite garnet
Rough to Cut
AVAILABLE FOR SALE
Honey, red & brown zircons, 10g parcels @$20/parcel
Red Garnet $8/g, eye clean-slightly included
Spessartine Garnet $7.50/g, slight-moderately included
Malaya Garnet $6/g, good eye clean roughs
Tunduri Garnet $10/g, eye clean-slightly included
Pink Tourmaline $20/g, eye clean-slightly included
Red Tourmaline $10/g, slight-moderately included
Bicolor Tourmaline $15/g, eye clean
Watermelon Tourmaline $20/g eye clean
Green/Green Blue Tourmaline $10/g, eye clean roughs
Blue, Green & Blue/Green Sapphires $35/g, eye clean-slightly included, up to 1g.
Blue Beryl (Aquamarine) $6/g, eye clean-slightly included crystals
Green Beryl (Emerald) $10-$50/g, eye clean-slightly included crystals, zoned green
Cabbing Grade Aquamarine $3/g
Complete online discount catalog for cabbing and faceting machines, wheels,
laps, polishes, diamond saws, diamond blades, and general lapidary supplies
Solid copper laps 1/4 thick 8" and 6" you can charge both sides with
diamond. Other laps too !! http://www.jewelersgems.com
NOW ONLINE! RRGaetan Gem Rough - Featuring excellent, facet-grade,
Colombian Emerald rough! PLUS, Chrome Tourmaline, Achroite Tourmaline,
Golden Chrome Tourmaline, Aquamarine, Spess, Mint and Malaya Garnets,
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LIST and WEBSITE INFO~
LAPIDARY ARTS and FACETERS DIGEST
is produced by Thurmond Moore III
Tempie Francis, Attorney at Law / Legal Advisor
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