|
|
|
|
| ||
Diamond Jewelry Forums
 Picture Gallery
 Video Gallery
 Journal
|
|||
|
|  Search
|  Posted Today
|  Most Active
|  Help
|
||
 »
Home
»  » Diamond Prices and Grading »
 » RockyTalky
»  » Are inclusions seen before diamond is cut ???
|
|
 |
Are inclusions seen before diamond is cut ??? |
 |
| P: 3/13/2005 6:36:33 PM | |
Maxine Ideal Rock Total Posts: 1,394 Last Post: 10/25/2009 Member Since: 12/6/2004 |
I see so many diamonds with different inclusions and clarity plots.....When can the cutter see the inclusions? I'm sure some signs of possible inclusions are evident in the diamond "rough,"but then others are discovered at some point during the cutting process. Don't these inclusions sometimes determine what the cutter does with a diamond? I think I have read that sometimes a diamond ends up with a tilted table or something because the cutter doesn't want to allow a feather to break the surface....Is this true? |
| Posted: 3/13/2005 6:36:33 PM | |
|
There are 8 replies to this message. There are 8 replies on this page. |
|
| P: 3/13/2005 6:56:45 PM | |
Garry H (Cut Nut) Ideal Rock Total Posts: 11,577 Last Post: 11/22/2009 Member Since: 8/16/2000 |
Yes Sergey who invented Diamcalc is the world leader in rough diamond planning equipment that scans the roiugh and the inclusions and from the 3D model it calculates the most valuable cutting opions. Garry Holloway FGAA DipDT |
| Posted: 3/13/2005 6:56:45 PM | |
| P: 3/14/2005 7:37:24 AM | |
Antwerpman Rough Rock Total Posts: 32 Last Post: 6/17/2005 Member Since: 5/6/2004 |
in your honest opinion of course Gary  (or should you be more like a carlesburg lager advert and add `probably`) The view of inclusions in the rough piece depends largely on the characteristics of the rough stone, with crystals being easy to see in to and frosted or coated stones sometimes being completely impossible to see in to. In some instances a `window` will be polished in to the stone in order to allow the manufacturer to better see inside and decide the position, size or number of inclusions. However the view in to rough will never be as good as with a polished stone and for this reason many people will only estimate rough up to VVS1 or VVS2 categories as smaller defects will sometimes only become apparent when the stone is cut and you can view it through all the polished facets. When deciding on how to cut the stone the manufacturer will consider many different factors such as sacrificing size to polish out an inclusion and create a better quality grade, maximising weight to reach a price break or even polishing a given stone to ensure that it can be sold quickly (it is no use polishing `nice` stones if they sit in your inventory for 2 years). Of course at the end of the day all the manufacturer can do is to estimate the polished outcome and it is possible that an inclusion is deeper in the stone than they thought, or that a gletz (crack) runs in to the stone during cutting, thus meaning that the predicted outcome is not achieved.
|
| Posted: 3/14/2005 7:37:24 AM | |
| P: 3/14/2005 8:50:20 AM | |
|
Maxine Ideal Rock Total Posts: 1,394 Last Post: 10/25/2009 Member Since: 12/6/2004 |
I was thinking of this scenario: a cutter is carefully cutting a stone to "ideal" or "superideal" proportions (whatever they are...), and dang!! there's a cryatal, feather..whatever where he doesn't want to see it! How discouraging!!! Is this taken against him (by the BOSS cutter)?
|
| Posted: 3/14/2005 8:50:20 AM | |
| P: 3/14/2005 11:36:05 AM | |
|
Antwerpman Rough Rock Total Posts: 32 Last Post: 6/17/2005 Member Since: 5/6/2004 |
In the more valuable stones the production is usually controlled very carefully and there is a lot of discussion between the cutter and his 'boss' on any stones where there may be a problem. So in the scenario mentioned the boss would already be aware that the stone was borderline or that there was a potential problem. This would then be discussed with the cutter, and if necessary the stone would be examined more frequently than normal with the cutter regularly bringing it back to his 'boss' so that they could discuss progress and see if the outcome they hoped for would be achieved. Of course there are factories where this does not happen, but with improvements in the industry they are becomming less common, and with smaller stones this will happen less frequently or not at all depending upon the actual type of goods and factory controls in place. Certainly if the 'boss' is surprised by such a stone then he has not been doing his job well enough in the first place as all these things should be under his control.
|
| Posted: 3/14/2005 11:36:05 AM | |
| P: 3/14/2005 12:04:29 PM | |
niceice Ideal Rock Total Posts: 1,792 Last Post: 7/22/2008 Member Since: 1/29/2003 |
Although we have no personal experience with it, we are aware that Sarin sells a "DiaExpert" which is supposed to evaluate diamond rough and assist the cutters with determining the best yield for the rough. More information on the equipment can be found Here
Todd L. Gray, President |
| Posted: 3/14/2005 12:04:29 PM | |
| P: 3/14/2005 2:43:29 PM | |
|
Garry H (Cut Nut) Ideal Rock Total Posts: 11,577 Last Post: 11/22/2009 Member Since: 8/16/2000 |
Yes AntwerpMan that is a great analysis. It was a habit to plan a stone, saw it and then send the two halves to factories in other countries and pray that you get what you expect back. Maybe there were 2 or more factories used from different countries and the average of the results compared. A worse case still is sending the rough out to contract workers who polish in their homes or villages. this practice was why children often were involved - they lived next to the wheel. Today contract cutting is all but dying out. Larger manufacturers have designed processes with every stone examined at each step of the process and every operation, sawing, bruting, blocking , brillianteering etc is done by a different expert - so there is not one guy that gets his legs broken. Garry Holloway FGAA DipDT |
| Posted: 3/14/2005 2:43:29 PM | |
| P: 3/14/2005 5:18:45 PM | |
Rank Amateur Ideal Rock Total Posts: 1,547 Last Post: 5/5/2009 Member Since: 2/26/2003 |
When you see someone at the wheel polishing, looking into the stone, polishing, looking, back and forth, are they looking for inclusion positioning or is it facet meet points and the like? I presume by the time it gets blocked out the inclusions are already accounted for and all the peering is for the faceting.
|
| Posted: 3/14/2005 5:18:45 PM | |
| P: 3/15/2005 2:06:05 AM | |
|
Antwerpman Rough Rock Total Posts: 32 Last Post: 6/17/2005 Member Since: 5/6/2004 |
in most cases they are looking at the facets to ensure that they are correct. After all it gets pretty dirty on the polishing wheel and only the currently polished facet is usually free from all the dirt. Having said that if the polisher was aware of stress in the stone, a gletz that may `run` in to the stone or is trying to eliminate a particular pique (inclusion) to improve the clarity grade then he will be paying attention to what is happening inside the stone as well
|
| Posted: 3/15/2005 2:06:05 AM | |
 Previous Page
|
Next Page 
|
Contact Us | Back Home | Privacy Statement | Forum Agreement | Forum Policies | |
| Ideal BB Version: 0.1.5.4.beta1 | Message forum software powered by the Ideal BB |
| |
Pricescope -
Knowledge -
Diamond Prices -
Tools -
Resources -
About
© 2000-2009 Pricescope. Terms of Use Privacy Policy Disclaimer
forum archives
