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Some information on single cuts:
http://www.artofplatinum.com/glossary/singlecut.htm Single cuts are best for pave work as they sparkle more. A full cut melee will look too busy in that tiny size. Single cuts in pave are essentially RBs with less faceting. |
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Most jewelers use brilliant cut. I chose to use single cuts after seeing them in person. The sparkles just seemed a little bigger, which I thought would match well to the flashes of my cushion. I think the reason is the table is significantly larger (since they only have 8 facets). The single cuts were also more expensive ($1000/ct v. $1500/ct).
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The same light return rules are very important.
Here is a little box with 45 full cuts on the top and the lower left, and single cuts above. The full cuts are from our regular stock which are all selected (usually 80% rejection) with an ideal-scope. Note the overall brightness. (The single cuts we stock for repair replacements as a client service, so they are ''as they are''). Note the lower photo - i took this during a discussion with Peter Yantzer who is interested in this topic also (lab Director at AGS). The stones were in the bottom of my wheely travel bag which was partly closed - with a single halogen about 10 feet 3M above. Note the single cuts show a lot more fire at about 1.2M to the camera.
Garry Holloway FGAA DipDT
HCA and Ideal-scope developer http://www.ideal-scope.com and http://www.HollowayDiamonds.com.au |
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really? you''d think it would be the other way around...hmm. |
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WOW Gary - thanks for that info! Now I wonder what I have in MY ring...full cut or RB's. No way to tell, they're so small! It's funny how these follow opposite brilliance rules when small, as compared to larger sizes, where RB is king. ETA: Silly me - I bet it says in my appraisal.
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I have no idea if this is true or not but I wonder if it''s a matter of supply and demand. Fewer people cut the single cuts and therefore there are less available. Leon''s assistant mentioned that sometimes it takes 1-2 weeks to get them from his supplier in Belgium. |
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Unless you use some OMC melee''s...., great sparkle factor! ![]()
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A supply and demand issue - so much demand for full cuts - single cuts are a nuiscance for most dealers. It is also easier to see cutting errors in full cuts Edit - easier to see cutting errors in single cuts
Garry Holloway FGAA DipDT
HCA and Ideal-scope developer http://www.ideal-scope.com and http://www.HollowayDiamonds.com.au |
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ACA''s are all full cuts |
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for those that missed my lesson on virtual facets see here:
http://www.pricescope.com/forum/rockytalky/my-asscher-looks-so-cool-in-low-light-anyone-else-t83928.html For those that read it here is why single cuts have larger flashes. Compare the virtual facet sizes. full cut first:
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Close up the single cuts can look Ok, but from further away the chance of seeing a flash becomes very small.
I think I am converting to being a full cut fan. The DETAS image shows that the light return Storm mentioned is alive and well
Garry Holloway FGAA DipDT
HCA and Ideal-scope developer http://www.ideal-scope.com and http://www.HollowayDiamonds.com.au |
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So, which do you prefer, Gary? |
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I definitely saw your lesson! And it all makes sense...it''s just ironic that one would prefer more facets for large diamonds, then switch to less facets for melee. I get why, I suppose, but still. Thanks again, storm, for your infinite knowledge! |
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Gary - what was the weight on those little rocks? |
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Part of the reason single cuts work well for melee with larger center stones in my opinion is that the virtual facet size more closely matches the small virtual facets of the larger stone so they tend to fire off at around the same time where full cut melee the virtual facets are so much smaller that they fire out of sync with the center stone. A princess or a crushed ice radiant would work better with full cut melee for the same reason. |
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This is really interesting, Storm, thanks! I know EXACTLY what you are talking about. In very bright overhead sun, my AGS-0 2.36 RB goes pretty dark and (dare I say!) *murky* (but with large, bold flashes of fire), while my melee (<.02 ACAs) go crazy beautiful, sparkling and twinkling like bright, colorful little disco balls. So, hypothetically speaking, of course (since I am NOT getting a re-set any time soon!), single cut melee would give me an entirely different look in that type of lighting environment? |
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Sir Garry, As usual, you lost me with your Aussie-speak!!! Exactly WHICH are WHICH again?! Thanks! Lynn |
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You would get bolder flashes off the single cut. Yes it would be a different look. Cant say however if you would like it better. |