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radiant vs. round

P: 5/29/2007 9:26:33 AM
stary-eyed04 Rough Rock Total Posts: 30 Last Post: 4/17/2008 Member Since: 5/18/2007	Will a 2 carat radiant diamond look smaller than a 2 carat round diamond?
Posted: 5/29/2007 9:26:33 AM

There are 10 replies to this message. There are 10 replies on this page.

P: 5/29/2007 10:02:53 AM
Lorelei Ideal Rock Total Posts: 34,254 Last Post: 11/24/2009 Member Since: 4/30/2005	Here is a chart which will give you a rough idea, http://images.amazon.com/media/i3d/01/actual-diamond-size.pdf but many factors can affect which looks largest such as the cut quality, whether a diamond is cut too deep, shallow, thick or thin girdle etc. You need to check out each as an individual with their diameter measurements in particular and remember that both shapes are very different to each other. Lastly, Radiants can't really be judged by the numbers, it is best to see what your eyes tell you, but with buying online see what your vendors can offer with pictures and cut quality images etc. Nothing is more sacred as the bond between horse and rider...no other creature can ever become so emotionally close to a human as a horse. When a horse dies, the memory lives on because an enormous part of his owner's heart, soul, very existence dies also...but that can never be laid to rest, it is not meant to be... - Stephanie M Thorn
Posted: 5/29/2007 10:02:53 AM

P: 5/29/2007 10:05:02 AM
JohnQuixote Ideal Rock Total Posts: 5,212 Last Post: 5/24/2008 Member Since: 9/9/2004	Many will, but it depends on how they were cut. Use the first two mm measurements (l x w) to determine face-up spread. A standard 2ct RB will have an average girdle diameter close to 8.15 mm. A square radiant with a depth near 70% will be closer to 7.15 mm, but it depends on cut. Starset orientation can make a square appear larger but non-round shapes dont have the edge-to-edge light return that the best rounds do, particularly at the corners. There is discussion in this thread that might be helpful. John __________________________ John Pollard Whiteflash Director of Education 2004-2007
Posted: 5/29/2007 10:05:02 AM

P: 5/29/2007 10:19:27 AM
DiaGem Ideal Rock Total Posts: 3,927 Last Post: 11/21/2009 Member Since: 10/21/2004	Date: 5/29/2007 10:05:02 AM Author: JohnQuixote Many will, but it depends on how they were cut. Use the first two mm measurements (l x w) to determine face-up spread. A standard 2ct RB will have an average girdle diameter close to 8.15 mm. A square radiant with a depth near 70% will be closer to 7.15 mm, but it depends on cut. Starset orientation can make a square appear larger but non-round shapes dont have the edge-to-edge light return that the best rounds do, particularly at the corners. There is discussion in this thread that might be helpful. A squarish Radiant having a 8.15mm LxW (average) diameter with a 50% total depth should weigh two carats. It does not mean it will look great... ********************** >Y< Yoram F. Antique Diamond Gem http://www.diagem.net/ "When it doesn't exist, design it..." Sir Henry Royce
Posted: 5/29/2007 10:19:27 AM

P: 5/29/2007 10:47:31 AM
JohnQuixote Ideal Rock Total Posts: 5,212 Last Post: 5/24/2008 Member Since: 9/9/2004	Date: 5/29/2007 10:19:27 AM Author: DiaGem Date: 5/29/2007 10:05:02 AM Author: JohnQuixote Many will, but it depends on how they were cut. Use the first two mm measurements (l x w) to determine face-up spread. A standard 2ct RB will have an average girdle diameter close to 8.15 mm. A square radiant with a depth near 70% will be closer to 7.15 mm, but it depends on cut. Starset orientation can make a square appear larger but non-round shapes dont have the edge-to-edge light return that the best rounds do, particularly at the corners. There is discussion in this thread that might be helpful. A squarish Radiant having a 8.15mm LxW (average) diameter with a 50% total depth should weigh two carats. It does not mean it will look great... Just so. Refer to my yeller, feller. John __________________________ John Pollard Whiteflash Director of Education 2004-2007
Posted: 5/29/2007 10:47:31 AM

P: 5/29/2007 10:52:59 AM
DiaGem Ideal Rock Total Posts: 3,927 Last Post: 11/21/2009 Member Since: 10/21/2004	Date: 5/29/2007 10:47:31 AM Author: JohnQuixote Date: 5/29/2007 10:19:27 AM Author: DiaGem Date: 5/29/2007 10:05:02 AM Author: JohnQuixote Many will, but it depends on how they were cut. Use the first two mm measurements (l x w) to determine face-up spread. A standard 2ct RB will have an average girdle diameter close to 8.15 mm. A square radiant with a depth near 70% will be closer to 7.15 mm, but it depends on cut. Starset orientation can make a square appear larger but non-round shapes dont have the edge-to-edge light return that the best rounds do, particularly at the corners. There is discussion in this thread that might be helpful. A squarish Radiant having a 8.15mm LxW (average) diameter with a 50% total depth should weigh two carats. It does not mean it will look great... Just so. Refer to my yeller, feller. But off course!!! What do you think John..., can a 50% Total Depth Radiant still be considered a beautifull cut Diamond? ********************** >Y< Yoram F. Antique Diamond Gem http://www.diagem.net/ "When it doesn't exist, design it..." Sir Henry Royce
Posted: 5/29/2007 10:52:59 AM

P: 5/29/2007 12:10:22 PM
JohnQuixote Ideal Rock Total Posts: 5,212 Last Post: 5/24/2008 Member Since: 9/9/2004	Date: 5/29/2007 10:52:59 AM Author: DiaGem But off course!!! What do you think John..., can a 50% Total Depth Radiant still be considered a beautifull cut Diamond? Sure. At 50% a radiant can return light and have reflection but theres going to be leakage. It may be helpful for showing body color if thats a goal. It depends on total configuration and what the cutter was trying to accomplish... Trilliants are fashioned from macles but can still have great reflection, beauty and distinctiveness. Beauty is in the eye of the beholder. John __________________________ John Pollard Whiteflash Director of Education 2004-2007
Posted: 5/29/2007 12:10:22 PM

P: 5/29/2007 4:51:42 PM
Radiantman Rough Rock Total Posts: 99 Last Post: 9/29/2008 Member Since: 3/3/2005	A 2 ct round measuring 8.15 mm is geometrically the same size as a 7.2 mm princess or a 7.4 mm radiant. A square radiant measuring 8.15 mm would look as big as a 9.2 mm round. This is because the area of a circle is measured differently than the area of a square. I'm sure John didn't mean to suggest that a square radiant would have to measure 8.15 mm to look as big as a 2 ct round, but it kind of read like that. Stan Grossbard Original Radiant Cut Diamond www.radiantcut.com
Posted: 5/29/2007 4:51:42 PM

P: 5/29/2007 4:57:48 PM
DiaGem Ideal Rock Total Posts: 3,927 Last Post: 11/21/2009 Member Since: 10/21/2004	Date: 5/29/2007 12:10:22 PM Author: JohnQuixote Date: 5/29/2007 10:52:59 AM Author: DiaGem But off course!!! What do you think John..., can a 50% Total Depth Radiant still be considered a beautifull cut Diamond? Sure. At 50% a radiant can return light and have reflection but theres going to be leakage. It may be helpful for showing body color if thats a goal. It depends on total configuration and what the cutter was trying to accomplish... Trilliants are fashioned from macles but can still have great reflection, beauty and distinctiveness. Beauty is in the eye of the beholder. Agreed..., I have seen some drop dead gorgeous squares at around 50% TD..., and below!!! They are extremely trough to locate these days. ********************** >Y< Yoram F. Antique Diamond Gem http://www.diagem.net/ "When it doesn't exist, design it..." Sir Henry Royce
Posted: 5/29/2007 4:57:48 PM

P: 5/30/2007 1:22:30 AM
JohnQuixote Ideal Rock Total Posts: 5,212 Last Post: 5/24/2008 Member Since: 9/9/2004	Date: 5/29/2007 4:51:42 PM Author: Radiantman A 2 ct round measuring 8.15 mm is geometrically the same size as a 7.2 mm princess or a 7.4 mm radiant. A square radiant measuring 8.15 mm would look as big as a 9.2 mm round. This is because the area of a circle is measured differently than the area of a square. I'm sure John didn't mean to suggest that a square radiant would have to measure 8.15 mm to look as big as a 2 ct round, but it kind of read like that. It did read like that, inadvertently. I appreciate Stan keeping me on the straight and narrow. Here are wire frame simulations of the examples he provided. Thanks Stan. John __________________________ John Pollard Whiteflash Director of Education 2004-2007
Posted: 5/30/2007 1:22:30 AM

P: 5/30/2007 1:24:27 AM
JohnQuixote Ideal Rock Total Posts: 5,212 Last Post: 5/24/2008 Member Since: 9/9/2004	Date: 5/29/2007 4:57:48 PM Author: DiaGem Date: 5/29/2007 12:10:22 PM Author: JohnQuixote Sure. At 50% a radiant can return light and have reflection but theres going to be leakage. It may be helpful for showing body color if thats a goal. It depends on total configuration and what the cutter was trying to accomplish... Trilliants are fashioned from macles but can still have great reflection, beauty and distinctiveness. Beauty is in the eye of the beholder. Agreed..., I have seen some drop dead gorgeous squares at around 50% TD..., and below!!! They are extremely trough to locate these days. DG - If you have an opinion...to what do you attribute that? John __________________________ John Pollard Whiteflash Director of Education 2004-2007
Posted: 5/30/2007 1:24:27 AM

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