LAPIDARY ARTS and FACETERS DIGEST
Issue No. 96 - Friday March 28, 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 Next Week: Gemstone Photography Clinic
Homework for this weekend:
Here is an idea. Members could research this topic in old digest
IFA, LAD, USFG, Hale Sweeny's Lapidary Digest Archives and
compose a list of Issues and or URL's that are useful to the discussion
in addition to personal experiences.
Index to Today's Digest
01 RE: Quartz Polishing Clinic
02 RE: Quartz Polishing Clinic
03 RE: Thin rough for sale issues
Subject: polishing quartz and working through the grits
Date: Thu, 27 Mar 2003 17:05:33 -0700
From: Steve and Nancy Attaway <firstname.lastname@example.org>
Two things I wanted also to mention. When polishing quartz, I will
sometimes see a trigon pattern emerge. The pattern appears as a series
of triangles on a facet, but it is actually just below the surface and
not upon the surface. Famous gem artisan, Lawrence Stoller also
mentioned that he has seen this pattern when polishing quartz. He
understands the pattern as an indication of obtaining a complete polish
on a surface of quartz. Scott Wilson, who has polished telescope mirrors
in the past, said that these were sub-surface indications of the quartz
Speaking of things sub-surface, I am glad to know that faceters are
becoming aware of the sub-surface damage left after each grinding lap.
The damage layer left after each grinding lap is measurable. Again,
Scott Wilson brought this to my attention some years ago. Unless a
facetor eliminates all of the damage layer, a complete polish on a facet
will not be obtainable. That is why we should consider working through
the grits and not use the very coarse grits in the beginning.
Subject: Polishing quartz
Date: Fri, 28 Mar 2003 05:50:35 -0700
From: Ernie Hawes <email@example.com>
To avoid subsurface damage, after somewhat gross preforming on a cabbing machine,
depending on the size of the stone I cut on a 325 or 600 lap, prepolish on either a well
worn Nubond 600 or a steel 1200 and polish on a Dyna Lap cerium oxide lap. It's quick,
easy, gives me sharp flat facets and a good polish. It's probably not competition grade,
but it beats most anything else.
Albuquerque, NM USA
Subject: Re:Thin rough for sale warning
Date: Thu, 27 Mar 2003 20:40:47 -0800
To: LapidaryArtsDigest <firstname.lastname@example.org>
From: Noel Rowe <email@example.com>
Hi Denney & list,
> I have been made aware of quite a scam that is appearing on many web
> rough vendors' sites. The ploy is to advertize rough material,
> especially single pieces of rough, at good, but not fantastic prices.
> Usually, in addition to the prices, pictures and length by width
> information is given. This makes the deal sound both real
> and good. However, if you just do a simple calculation,<snip>
> However, when I did the calculation mentioned, it turned out that the
> stone could not be any thicker than 1.3 mm! I have found this on
> several sites so beware. A really quick, but quite rough, way to get
> the thickness is as follows:
> Thickness (mm) = weight (ct)x200 divided by SGxlength(mm) x width (mm)
I am a rough dealer. I try to describe my material as accurately as
possible. I use a digital caliper to measure the dimensions in three
directions (length, width & depth) & a digital scale to weigh in carats
of grams (depending on the material). A week or two ago I had an inquiry
as to why two pieces of tourmaline seemed to be inconsistent in their
dimensions & weights with regards to each other The questioner noticed
that one piece weighed less than the other even though if you added up
the length, width & depth & divided it back to get volume the one with
the apparent larger volume weighed less than the other piece. The only
explanation I could come up with was the profile of the material was
different. One piece looking down the C axis was a cushion trillion
shape & the other was more of a rounded hexagon. The profile of the
material has a big impact on the weight formula. for example I pulled
out a piece of tourmaline that is 6.2 carats. It is 11.07x7.85mm. Using
your equation it should be 6.2*200/3.02*11.07*7.85 = 4.725mm thick. It
isn't 4.725mm thick. It is 6.76mm thick. a difference of over 2mm. on a
stone that size that is quite significant. If you wanted to cut an oval
with a depth of 4.72mm you might get a 6x8mm stone while with a 6.76mm
depth you could expect a 9x7mm stone. When you are cutting expensive
rough that's a pretty big difference. My point is, when you are buying
rough it is very important to be sure what you are buying. Never buy
without finding out what all three dimensions are & what the profile of
the rough looks like. Also don't buy unless there is a full return
policy. Any reputable dealer will stand behind what they are selling. If
a customer of mine doesn't like what I have sent for any reason they can
send it back & I'll give them their money back no questions asked. I
even send it on approval for some of my established customers, so they
don't pay until they have held it in their hands & looked at it all they
wanted. Most dealers that I have encountered were honest & will be happy
to give you as much information about the rough as you want (they want
return customers). You won't stay in business long scamming people. Word
does get out.
Rough to Cut
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 ~
MEGA MORON AWARDS
Tennessee: A man successfully broke into a bank after hours
and stole the bank's video camera, while the camera was
remotely recording. (That is, the videotape recorder was located
elsewhere in the bank, so he didn't get the videotape of himself
stealing the camera).
Louisiana: A man walked into a Circle-K, put a $20 bill on the
counter and asked for change. When the clerk opened the
cash drawer, the man pulled a gun and asked for all the cash
in the register, which the clerk promptly provided. The man
took the cash from the clerk and fled, leaving the $20 bill on
the counter. The total amount of cash he got from the drawer?
Fifteen dollars. [If someone points a gun at you and gives you
money, was a crime committed?]
Arkansas: Seems this guy wanted some beer pretty badly. He
decided that he'd just throw a cinder block through a liquor
store window, grab some booze, and run. So he lifted the
cinder block and heaved it over his head at the window.
The cinder block bounced back and hit the would-be thief
on the head, knocking him unconscious. Seems the liquor
store window was made of Plexi-Glass. The whole event
was caught on videotape.
New York: As a female shopper exited a convenience store,
a man grabbed her purse and ran. The clerk called 911 immediately
and the woman was able to give them a detailed description of
the snatcher. Within minutes, the police had apprehended the
snatcher. They put him in the car and drove back to the store.
The thief was then taken out of the car and told to stand there
for a positive ID. To which he replied, "Yes Officer..that's her.
That's the lady I stole the purse from."
Ann Arbor:The Ann Arbor News crime column reported that a
man walked into a Burger King in Ypsilanti, Michigan at 12:50am,
flashed a gun and demanded cash. The clerk turned him down
because he said he couldn't open the cash register without a food
order. When the man ordered onion rings, the clerk said they weren't
available for breakfast. The man, frustrated, walked away.
Kentucky: Two men tried to pull the front off a cash machine by
running a chain from the machine to the bumper of their pickup
truck. Instead of pulling the front panel off the machine, though,
they pulled the bumper off their truck. Scared, they left the scene
and drove home. With the chain still attached to the machine.
With their bumper still attached to the chain. With their vehicle's
license plate still attached to the bumper.
REFLECTIONS AND TIDBITS:
Looking back, may I be filled with gratitude;
Looking forward, may I be filled with hope;
Looking upward, may I be aware of strength;
Looking inward, may I find peace.......
From: "RICHARD P ROSENTHAL" <firstname.lastname@example.org>
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,
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LIST and WEBSITE INFO~
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