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Diamond Diameter -- Need help

P: 1/12/2005 8:36:23 PM
PrincessBride Rough Rock Total Posts: 35 Last Post: 1/27/2005 Member Since: 1/12/2005	I hear everyone speaking of diamonds with such expertise. All I know is the 4C's, but it seems to extend lots further than that. I'm looking at a .80 carat diamond with the diameter being 5.94. I don't remember the depth. It is a size diameter considering the carats? Also, I hear many speaking of HCA and H&A, what are they? Thanks.
Posted: 1/12/2005 8:36:23 PM

There are 6 replies to this message. There are 6 replies on this page.

P: 1/12/2005 11:46:31 PM
RockDoc Ideal Rock Total Posts: 2,509 Last Post: 6/17/2007 Member Since: 8/16/2000	Date: 1/12/2005 8:36:23 PM Author:PrincessBride I hear everyone speaking of diamonds with such expertise.  All I know is the 4C's, but it seems to extend lots further than that.  I'm looking at a .80 carat diamond with the diameter being 5.94.  I don't remember the depth.  It is a size diameter considering the carats? Also, I hear many speaking of HCA and H&A, what are they? Thanks. The diameter of the stone, tells a lot about it. There are two diameter measurements. They represent the smallest measurement and the largest measurement. If they are far apart, then the diamond can look "out of round'. The measurements should be really close. They seldom are exactly the same. How much should they vary depends on the size of the diamond. The HCA ( Holloway Cut Adviser ) is a program that rates the cut of a diamond after you profile specific information about the stone. It favors somewhat shallowly proportioned stones. H&A Hearts and arrows is a pattern for a round diamond when viewed with an H&A viewing scope. On the top side are arrows and on the bottom side there are hearts. A "perfect" H&A image INDICATES a diamond will have good to excellent light performance... but this is not a guarantee.. But generally, its better to have a good image than none at all. THe images are indicitive of symmetry of the facets.If there is distortion, missing arrows, crooked hearts, then it may have a lower light performance than one that has a good image- both from top and bottom of stone. Hope this helps, Rockdoc Bill Leiberum 1948-2007 Thanks for everything and Rest In Peace,Bill.
Posted: 1/12/2005 11:46:31 PM

P: 1/13/2005 1:17:16 AM
Superidealist Ideal Rock Total Posts: 655 Last Post: 8/23/2006 Member Since: 9/10/2003	Here are two threads on the topic of the relation of diameter to carat weight. The "ideal" diameter for a 0.80ct diamond is about 6.03mm. D Riley
Posted: 1/13/2005 1:17:16 AM

P: 1/13/2005 2:43:07 AM
PrincessBride Rough Rock Total Posts: 35 Last Post: 1/27/2005 Member Since: 1/12/2005	Thanks everyone for answering my questions. So, a 5.94mm on the largest diameter is small for a .80 carat diamond?
Posted: 1/13/2005 2:43:07 AM

P: 1/13/2005 12:20:12 PM
Josh@JA Cut Rock Total Posts: 366 Last Post: 2/18/2008 Member Since: 9/11/2003	I'm looking at a conversion chart as I'm sitting here typing this message. According to this chart a properly cut .80ct round brilliant would be exactly 6.00mm. A .75ct would be 5.8mm. So that 5.94mm diameter is extremely close to what's perfect. Remember, we are talking about "Millimeters". If someone can tell the visual size difference between 5.94mm and 6.00mm than they are looking too close.... _______________ Josh www.JamesAllen.com
Posted: 1/13/2005 12:20:12 PM

P: 1/13/2005 12:35:16 PM
denverappraiser Ideal Rock Total Posts: 4,614 Last Post: 11/22/2009 Member Since: 7/21/2004	You can read about HCA here. You can read about H&A here. Both are discussed in the tutorial at the top of the page under 'knowledge'. Neil Beaty GG(GIA) ISA NAJA Independent Appraisals in Denver There's never a crowd when you go that extra mile.
Posted: 1/13/2005 12:35:16 PM

P: 1/13/2005 2:56:07 PM
GettingEngaged Rough Rock Total Posts: 21 Last Post: 4/5/2005 Member Since: 1/12/2005	I'm working with princess cut diamonds. Are there ideal dimensions for princess cut, 80 - 90 points?
Posted: 1/13/2005 2:56:07 PM

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