Grade reduction should be commensurate with price differential of weight gain accross boundaries.. How many "grades" depends on what scale (or girdle "definition" see the earlier thread on this ) one is using, I'd cut it down 1/2 to 1 grade (on a 5 grade scale) which balances out increase in performance due to painting pavilions.
Sarin FacetWare report. Grade Excellent. Final GIA grade Poor.
How should work cutters now?
Owner diamond was sure : Diamond will receive Very good. But diamond received Poor just. And what is important GIA mark girdle. Owner can not send diamond to other labs without remove GIA laser inscription. After repolishing weight will 0.49( may be).
Gary...I discussed measuring the angles through the axias rather than from the table. To correct angles through the axias does not correct angle straightness 90 degrees to the two 180 degree angles that it would correct, and also, in everyday life terms, to correct how a stone looks simply by tilting it to change the axias, then one would assume it would have to be mounted in a setting crooked, no?Date: 2/6/2006 11:24:47 PM
Author: Garry H (Cut Nut)
Marty i will email you and a few others a full DiamCalc.
tell me if you would like a copy garryh @ ideal-scope.com
If you open the File area in the top left you will see complete report data.
Bill - I agree with everything you wrote
Except the stone''s angular variance is actually quite small when measured thru the axias rather than from the table reference point.
Sergey: If you recut the stone to a 34.5 top keeping the same table, wouldn''t that reduce the weight as you would have to cut into the girdle plane.. Initial cutting from the rough may have gained you, but that is supposition. It is all part of the planning..
Not so for a small stone like this Marty - the girdle is 0.3mm in the thickest part - and that is not as thick as most colored gems that size.
Careful Marty - this idea leads to different grading for a say 1.000ct than 1.10ct?????????????????????????
Maybe not "cool" like you say, but certainly something to take account of.. weight boundaries are a fact of life and pricing..maybe they shouldn''t be, but appraisers understand them
1.10 is worth less per carat in the real market than 1.00 exactly.
Well, I find that hard to believe. I for one would guess that most stones at 1.0 have been cheated to get the weight, and that most at 1.1 are probably better made, because the incentive to break a weight boundary is gone and more attention paid to better cutting .. ony opinion, but I for one would not say that a 1.0 is worth more per carat than a 1.1.. sounds stooopid as you say, from my viewpoint , but you are entitled to your opinion.
re:that a 1.0 is worth more per carat than a 1.1.. sounds stooopid as you say, from my viewpoint
( cutter has not motivation to receive 1.05-1.10)for same diameter cutter usually( it depends from shape rough, inclusions, Is it first diamond or second) can receive better yield from rough for crown 34.5 than crown 32.5 ( If we are speaking about real world of cutting not about repolishing. Any repolishing can decreasing mass only)
Red is painted Green diamond.
I think Red diamond has better performance than Green diamonds.
Why Red is AGS5=(0 for Light performance+ 5 due thickness girdle) if
Printing the report and laser-inscription of the number does not happen automatically at the lab. Always, the results are first communicated, and the owner has the time and the opportunity to ask for re-checks and/or to have the stone returned without the report and the inscription.
You are probably right, Bill. Without the actual rough stone, we cannot be sure, but it is highly unlikely that this is the result if he could have saved more weight with a steeper and higher crown. Even if this meant that the pavilion needed to be cut less deep, in order to maintain performance.
Diameter 5,16 5,16
re:Also, IMHO, the 33 stone with the bottom angle over 41 would be a darker looking stone, and most in the trade would accept the notion that it was the ''poorer'' of the two cuts.
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