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LAPIDARY ARTS and FACETERS DIGEST
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Issue No. 218 - Thursday, October 2, 2003
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Moderated by: Thurmond Moore III
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Committed to carrying on the fine works of
Hale Sweeny and Jerry Dewbre
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POST TO EITHER LINK BELOW:
lapidary@caprock-spur.com
faceters@caprock-spur.com
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VISIT OUR WEBSITE TODAY
http://www.gemcutters.org
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Hi all,

This would have been sent sooner if there were
a few more post earlier. More post equals higher
priority in publishing the list.

Thurmond

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Index to Today's Digest

01  NEW: Solid Black Facet Rough?
02  RE: Cutting Ovals !


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Message:01

Subject: Solid Black Facet Rough?
Date: Wed, 1 Oct 2003 18:30:47 -0600
To: <faceters@caprock-spur.com>
From: "Todd" <td_gunz@yahoo.com>

Hi all,
            Those were interesting posts about cutting ovals.  It really
helped me a lot.  I've only been faceting a little over a year now and
"traditional" ovals have been something I've shied away from.  The near
constant changing of the mast height and the angles as you work around
the pavilion has never quite worked out for me. 
            I've cut plenty of barion ovals, or omni oval (they are the
same right?).  The ones where you cut to center point and then put in
the barion or 'cheek' facets in next to the girdle.  The only problem
I've had is if my L/W is off the barions look like the Rocky Mountains I
can see from my window.
            Anyway, without further rambling, on to my question. 
I have an order for a set of stones for a pendant, earrings, and ring.
The stipulation is they have to be faceted solid black (no light visible
thru them), and all the same relative design.   
            I tried to tell her to get cabs as there's a plethora of
black cabbing material out there and plenty of them available.  She saw
a faceted set on someone else at a big business conference she went to,
and just has to have faceted black stones.  I'd given her daughter a
stone I'd cut and that's how I got this order.  I'm finally getting the
word out to some people that I'm a colored stone faceter.    
            What I'm having trouble with is finding a black material
that can be faceted and finish out solid black with no see thru.  I cut
a black looking Apache Tear but it finished out like a dark smoky quartz
in the middle and graduated lighter towards the girdle.  Obviously that
material's out of the running.
            I just got some black tourmaline sent to me, and have some
more coming in a few days.  This first batch is small crystals and
broken bits.  It's got the typical tourmaline striations running up the
sides and seems like good shiny solid looking crystals without any
visible imperfections of off color in them. 
            Morion Company has some black Cubic Zirconia for .20 per
gram.  They also had something called YIG (yttrium-iron garnet) which is
a flux grown garnet.  It's solid shiny black and comes in "small well
developed crystals from 2-5 to 30-40 carats" per the info on their site.
It's $3.50 per carat.  I'm not good at figuring out what sized rough I
need for a specific sized stone, and I don't know if they'd want to give
me the measurements of a few crystals or not.
            I saw a ring on eBay last nite which had a faceted Black
Sapphire, but it didn't say if it was synthetic or not, and I couldn't
tell from the price.  Is there such a thing as natural Black Sapphire?
If there is, I wonder why there's no synthetic Black Corundum?
            Because the stone is solid and no light gets thru, the
critical angles and the R/I won't mean much.  I'm free to use any design
that's attractive.  As long as I get a really good polish on the crown
and the meets really crisp and sharp, I should be in good shape.  It's
certainly going to be challenging.
            I'm going to dop up a small piece of the tourmaline I've got
and see how it cuts/polishes.  I was thinking of waiting until I heard
back from the digest in case it'll ruin my laps cutting this material,
but I guess I'll know sooner rather than later.
            Any comments, info, or advice would be appreciated greatly,
as I'm stumbling around in the dark on this one.  Of course I find I do
that a lot in life anyway.
           
            Thanx to all for the great information which is available on
the Digest and thanx Thurmond for putting the time into making this
happen every day.
 
Todd Shinskey of "Todz Rox" <-- that's the name of my custom colored
stone faceting business; I'm Todd and they're my rocks until I sell
them.  Plus it made a great looking logo, hehee.

__________________________________________________________
Message:02

Subject: CUTTING OVALS
Date: Fri, 3 Oct 2003 11:51:36 +1000
To: <faceters@caprock-spur.com>
From: "Arch & Jan Morrison" <archnjan@serv.net.au>

Thanks to all who have responded on this subject, especially Dan Clayton
who has provided solid advice on the sequence of cutting. Notice a few
responses mentioned "bow tie" effect and someone asked for indication of
a design which did not have this effect. To round out the discussion,
would someone like to explain for the uninitiated :
1.  what the bow tie effect is
2. why it is bad (or undesirable)
3. what aspect of a cutting design causes "bow tie" i.e. what aspects
should be avoided. (e.g. is it more prevalent in centre-point designs or
designs with a keel).
I think this is an important aspect of cutting ovals and I'd love to
answer these myself but don't believe my understanding of this aspect is
good enough to do so. I agree very strongly with the comments of others
that Ovals (and Marquises and Navettes) are an essential part of a
faceter's arsenal in order to maximise return. I recently did a 2.1
carat Oval in Robert Strickland's "Fast track" design (DVue code 17.024)
in Sapphire which was 9.5mm by 7.0mm. If I could only cut rounds I would
have got a 7.0mm SRB or approx 1.3 carats - big difference - both in
size and price!
Arch Morrison
Buderim, Queensland, Australia.

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Post something from your experiences in gemcutting today!
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TODAY'S FUNNY ~

"Children are like sponges. TV is NOT a good babysitter!"
 
A mother was reading a book about animals to her 3 year old daughter.

Mother: "What does the cow say?"

Child: "Moo!"

Mother: "Great! What does the cat say?"

Child: "Meow."

Mother: "Oh, you're so smart! What does the frog say?"

And this wide-eyed little 3 year-old looked up at her mother
and in her deepest voice replied, "Bud."
   
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TIDBITS AND REFLECTIONS~

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---Victor Borge---

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