Joined: Sat Aug 18, 2007 11:46 pm Posts: 353 Location: Kingsport, TN
That stressed piece of tourmaline you're cutting will never show its evil intentions when you're cutting the pavilion (that is, when the problem is more easily corrected). It will always wait until you're finishing the crown, or better yet, after you've removed it from the dop.
Inclusions that are "barely" surface breaking grow at a rapid pace after cutting begins. The degree of intrusion into the stone is directly proportional to the cost/value of the rough.
Faceters definition of clean rough is gemstone rough that is not full of inclusions, veils and cracks spiderwebbing through the stone. Rough dealer's definition of clean rough is "I washed the dirt off of it."
_________________ "Distracted by something shiny."
Joined: Fri Feb 24, 2006 1:20 am Posts: 2756 Location: Southern California, U.S.A.
Gearloose wrote:
The Litterbox Gravity Singularity
I was going to mention something along those lines but I don't have a litterbox near my machine. In my case some aspects of Quantum Theory come into play, specifically: How an object can be simultaneously both visible and invisible.
I have an old carpet remnant beneath my machine to soften the impact of dropped stones. Nearly 100% of the time when I drop a stone it simply vanishes. It goes away as if it slipped off into parallel universe. It can't be found no matter how long I crawl around in the Jeweler's Position (nose to ground, rear end elevated) with flashlight in hand.
Yet when I check the next morning, there it sits sassing me, clearly visible, right where I looked before . This happens with such regularity I've come to the Heisenbergian conclusion that if it ain't visible in the evening, it'll show up in the morning.
Joined: Tue Jun 12, 2007 6:41 pm Posts: 5534 Location: Massachusetts, USA
Quote:
Faceters definition of clean rough is gemstone rough that is not full of inclusions, veils and cracks spiderwebbing through the stone. Rough dealer's definition of clean rough is "I washed the dirt off of it."
Another sales favorite is "Mine Run". (We didn't look at it or highgrade it, Promise..)
It REALLY means, "We saw it at the mine and RAN AWAY."
Well, I don't have a litterbox or a carpet. When I drop a stone, index gear, etc. and other small objects, they seem to end up under or behind the last thing you would want to move to look under. Like my desk the machine is on, or the shelf with a ton of rough on it.
Think I may have to unload that shelf and move it to find my 80 index gear I dropped last night.
.
_________________ "Distracted by something shiny."
O.K, a little off the subject, but here in my area, "virgin ground, never been dug". On the surface, maybe, but 40ft down, who knows? Or, when referring to a gem which has been found on the surface,"I stubbed my toe on it! True! yeah, right. Barry.
Joined: Thu May 29, 2008 8:32 am Posts: 1730 Location: Suwanee, GA US
The probability of a dop dropping onto the end increase with the smaller amount of concrete flooring exposed and the more prone the stone is to breaking with an impact. Always assume that if you drop a dop with opal, tourmaline, or perfect cleavage, it will hit the 1 mm of exposed concrete surrounded by carpet. Because it lands on the top end (gem up), it will both break the stone and launch the broken pieces a distance the square of the height it was dropped. Then see Litterbox Singualarity Theory....
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