Issue No. 216 - Tuesday, September 30, 2003
Moderated by: Thurmond Moore III
Committed to carrying on the fine works of
Hale Sweeny and Jerry Dewbre
Hi All,

Good list today. Our OVAL topic is still producing
some good post.


Index to Today's Digest

01  RE: Cutting Ovals !
02  RE: Cutting Ovals !
03  RE: Tazmanite aka Tashmarine
04  RE: Tazmanite aka Tashmarine
05  RE: Tazmanite aka Tashmarine
06  RE: Tazmanite aka Tashmarine


Subject: Cutting Ovals
Date: Mon, 29 Sep 2003 11:38:10 -0700
To: <lapidary@caprock-spur.com>
From: John Kilian <john.kilian@verizon.net>

Okay, Okay Thurmond I have some oval experience I can relate. When I started
faceting 2 years ago I was terrified by ovals. My first one in clear quartz
had horrible bow tie effects and the meets were shall we say less than
perfect. After a little more practice and choosing only barion designs the
bow ties are gone and the stones look great. Ovals are now my second
favorite cut next to triangles. Jeff Graham has several good designs I have
used "http://www.faceters.com/designs/rainbow.shtml" as do Long and Steele
in Vol. 1. I have sold several and currently have two on my website under
garnet and quartz "http://www.kiliancollection.com/index.php?page_id=17".
Keep after those avals. They work.
John Kilian
The Kilian Collection


Subject: Re: Breakpoint cutting Fred's K12 1.6 oval
Date: Mon, 29 Sep 2003 16:33:09 -0400
To: lapidary@caprock-spur.com (LapidaryArtsDigest)
From: Dan Clayton <dclayton@speakeasy.net>

On Monday 29 September 2003 02:51 pm, you wrote:
> Managed to follow your input except the "chain cut" instruction.
> Fred Van Sant's K12 Oval 1.6 has the following steps for the break
> facets:-
> 4  46.00    18 - 30 - 66 - 78
> 5  61.94     09 - 39 - 57 - 87
> 6  72.5       03 - 45 - 51 - 93
> To "chain cut" do I cut all of step 4 then all of step 5 ....etc or do I
> cut, in sequence, index 03, 09, 18, 30, 39...etc.
> Arch Morrison
> Buderim, Queensland, Australia

I am sorry I wasn't clear on that point Arch but I was trying to make
the description pretty general. BTW I think Fred was in the top two
or three designers of all time and maybe the best ever. But he was
not perfect, I think he should have given facet instructions for most
if not all designs. As far as I know he always gave at least one
workable cutting sequence for OMNI and Breakpoint ovals. This
Breakpoint oval will not cut with an OMNI cutting sequence.

The K12

cut first 4 tiers in order. That give 3 tiers of mains and four girdle
facets to set stone length. At this point you would chain cut the
remaining girdle facets if it was an on OMNI design.

chain cut tiers 4, 5 and 6 in order. That means you cut each of the
"half moon" pavilion break tiers in order.  It does mean you
meet 1-1-g1-g1 as close as you can at 18, 30, 66 and 78
indices then go on to cut tier 5 then tier 6. The girdle will not
be even until you cut chain cut g2 and g3 tiers. An OMNI would
be very similar but would cut all the girdle facets before cutting
the halfmoon breaks.

The point I was trying to make about the cutting sequence is that
you cut each one precisely in order. Tier 5 chains to tier 4 and
tier 6 chains to tier 5 don't try to spurt ahead with
sloppy cutting of the centerpoint, the girdle endpoints or the
pavilion breaks, errors will catch up with you latter. That does not
mean your centerpoint or other facets at 360 grit has to be perfect.
Maybe Art Kavan can see those meets at 360 but my old eyes
have great difficulty seeing meetpoints with 360 grit. Maybe I do
need a 30x microscope on my machine but I just clean everything
up at 600 and prepolish.

I think this is a good design even though I have never cut it. I
usually have only one tier of pavilion mains instead of three or
four but that is a designer's prerogative. I have not analyzed this
particular K12 oval but I am quite certain it does not "bow tie" or
window badly. OMNI, breakpoint and barion ovals should not
bow tie. That is why you use the halfmoon breaks. If you added
more culet facets in a brilliant style the K12 ovals would be
barion ovals.

Dan Clayton


Subject: Re: Issue No. 215 - Monday, September 29, 2003
Date: Mon, 29 Sep 2003 15:14:23 EDT
To: lapidary@caprock-spur.com
From: Facets@aol.com

In a message dated 9/29/03 1:51:32 PM, lapidary@caprock-spur.com writes:

<< A friend  told me that he has a stone of Tazmanite ( probably a family of
Diopside ) but I never found any information
about a stone with that name . Anybody know ? >>

Possibly "Tashmarine" (sp?), a fairly attractive, fairly new-to-the-market
green diopside.

        Charles B. Johnston
        TECHNOFACET, Ltd.


Subject: RE: Tazmanite gem?
Date: Mon, 29 Sep 2003 14:40:40 -0700
To: <lapidary@caprock-spur.com>
From: "Arnold Schwabe" <ars80@telus.net>

<A friend  told me that he has a stone of Tazmanite ( probably a family of
Diopside ) but I never found any information
about a stone with that name . Anybody know ? >

Columbia Gem House started pushing a trademark name of Tashmarine a few
years back. They use the name for a light green diopside found in Asia
somewhere (Uzbekistan or China??). I think it's just light green (not
chrome) diopside disguised (by name only) as the latest and greatest

Tazmanite doesn't ring any bells but there might be someone else out there
who's trying to push an old gemstone in a new wrapper.

Arnold S.


Subject: Tazmanite
Date: Mon, 29 Sep 2003 17:49:37 -0700
To: <faceters@caprock-spur.com>
From: Barbara Smigel <smigel@lvcm.com>

< A friend  told me that he has a stone of Tazmanite ( probably a family of
Diopside ) but I never found any information
about a stone with that name . Anybody know ? <

I think your friend is on the right track in the identification, the name is
wrong, though.  One of the big gem companies is marketing a green diopside
under the trade name "Tashmarine".

Barbara W. Smigel, PhD.
Graduate Gemologist, GIA
Artistic Colored Stones
840 S. Rancho Dr. #4387
Las Vegas, Nevada  89106
(702) 382-0694
website:  http://www.acstones.com
email:  bsmigel@cox.net


Subject: Re: Anybody ever heard about Tazmanite gem ?
Date: Mon, 29 Sep 2003 20:46:16 -0500
To: "LapidaryArtsDigest" <lapidary@caprock-spur.com>
From: "Rough Ventures" <info@roughventures.com>


The gem species you are referring to is not Tazmanite, but a gem called
"Tashmarine".  It is a lighter green species of diopside from somewhere
in Uzbekistan.  I believe Columbia Gem house is marketing the material
under the trendy name of "Tashmarine" to stir up interest and boost the
market price of the material.  The material is supposed to be fairly
expensive on the retail market.  However, there have been no formal
releases, at least to my knowledge, by anyone connected with the stone
as to whether or not the material is indeed rare or "exotic" enough to
warrant such pricing.  As with any trend or fad in the gem industry, I
would do extensive research on the material before investing in it, i.e.
Paraiba Tourmaline versus Blue Topaz...


John Thielmier









PERSONALS: (General Lapidary and Faceting)






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A cat at rest will tend to remain at rest, unless acted upon by
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