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LAPIDARY ARTS and FACETERS DIGEST
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Issue No. 246 - Friday, November 14, 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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lapidary@caprock-spur.com
faceters@caprock-spur.com
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Index to Today's Digest

01  RE: Cutting Sapphires
02  RE: Cutting Sapphires
03  NEW:  Gearlooses new Faceting Head

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Message:01

Subject: cutting sapphire
Date: Thu, 13 Nov 2003 14:34:20 -0600
To: <faceters@caprock-spur.com>
From: "Larry" <ldavis32@cox.net>

If you don't have a lot of silk in the stone you can cut sapphire oriented
in any direction you wish.
Many times it is advantages to rotate the stone to give the best color, such
as in a stone with lots of color zone problems, using color to your best or
you may have to turn the stone to give the best yield.  Don't be afraid to
try something new.

Larry Davis

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Message:02

Subject: Re: sapphires
Date: Thu, 13 Nov 2003 22:19:29 -0800
To: lapidary@caprock-spur.com (LapidaryArtsDigest)
From: Don Rogers <Don@Campbell-gemstones.com>

>(1)should sapphires be always cut on table.

I'm not sure what your question is here.

>(2)does it produce a brighter stone than off table.

Same

>(3)Will it lighten the stone by tilting say10deg off table

This question blends together two ideas,  One is that a stone is brighter
when cut in a specific orientation to the axis of the crystal.  Second, you
are confusing sapphires with stones with cleavage, IE topaz where you want to
keep the cleavage plane off any likely facets to prevent polishing problems  
The common knowledge is that orienting the cleavage plane 10 degrees off the table
will eliminate polishing problems.

>(4)How to locate the table by colour zones(no Polarascope).

When cutting sapphire, you will orientate the table to give the best
color.  Some times this will be placing a good color zone in the cullet
so it will propagate through the cut stone.  A polariscope is of little help here,
although it is a very valuable tool for the cutters, and very easy to make.

>(5)Best way to cut partycolour sapphires

It depends on your ideas for the finished stone.  If you wish to blend the
colors, you will place the color zone parallel to the table, or there about. 
If you wish to enhance the color demarcation, you will place the color zone
perpendicular to the table, AND select a design that will not blend the colors, 
A bagget , or emerald will be best, ovals and round the worst.

>(6) best designs and angles for sapphire

Check out Jeff Grams books.  He has a number of designs that will produce
knock out stones.

Don

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Message:03

Date: Thu, 13 Nov 2003 18:16:44 -0500
To: lapidary@caprock-spur.com
From: Facets@aol.com

     OK, folks, those of you who know me (or at least read my occasional posts) know
I am generally a man of few words. That having been said, allow me to wax eloquent
for a minute.
     I am happy to report that the question of "which faceting machine is best" has
been permanently relegated to my list of Questions With Only One Good Answer. My
answer?
     Well, as of yesterday I am the proud (make that ecstatic)owner of a genuine
Gearloose XS3 faceting head. My propensity for few words initialy got worse - from
"Oh my God" (3) to "Holy S**t" (2) to simply "Wow!" (1!).
     This is one superb bit of engineering and craftmanship. You like a soft stop
machine? Accurate angles diplayed by sealed electronics in LED's that look an inch
high, in 1/100th degrees. You want hard stop? An adjustable hard stop, again
adjustable to 1/100th degree. You want to use an indicator? The hard stop and its
contact are electrically isolated, so it is a snap to install (already tried it with
a cheapie universal meter!)
     Did I mention it is all HEAVY, beautifully finished stainless steel? That it
moves as smooth as butter? That if I ever give up faceting I'll display it as art?
     All the usual disclaimers apply - I'm just a happy, and very grateful, customer.
A public thank you to Gearloose, not only for inventions like the BATT laps and this
monster head, but for making them available to peons like me, with engineering skills
that stop after the ability to fix a toilet!
    
     Charles B. Johnston
     TECHNOFACET, Ltd.
     facets@aol.com

_______

Hi Charles, I am currently emerald green with envy. LOL

Thurmond

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TODAY'S FUNNY ~

An elephant was drinking out of a river one day, when he spotted
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across the river.

"What did you do that for?" Asked a passing giraffe.

"Because I recognized it as the same turtle that took a nip out of
my trunk 53 years ago."

"Wow, what a memory" commented the giraffe.

"Yes," said the elephant, "turtle recall".


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