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 » RockyTalky
»  » DCLA Grading?
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DCLA Grading? |
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| P: 10/21/2004 7:20:41 AM | |
atelier7 Rough Rock Total Posts: 20 Last Post: 11/11/2004 Member Since: 9/30/2004 |
Hi, my diamond is DCLA graded. I'm trying to understand what it's grading means, how it translates to grading by other labs. Are these within similar ranges from other labs? 1. Roundness 1.6% = VG Is 5.68 - 5.77 x 3.54mm really very good in terms of roundness? 2. Girdle Thickness 3.5% = VG? 3. Cutlet 0.7% = Very Small 4. My stone also has a VG Proportion Grade? What does that mean?
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| Posted: 10/21/2004 7:20:41 AM | |
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There are 5 replies to this message. There are 5 replies on this page. |
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| P: 10/21/2004 7:28:37 AM | |
mdx Ideal Rock Total Posts: 570 Last Post: 11/29/2007 Member Since: 3/1/2002 |
Nathan DCLA grade to IDC (International Diamond Council) rules. These are the same rules as HRD. Their highest grade is Very Good and the lowest grade is Unusual. Johan Diamond Exchange Ltd. (Australia) |
| Posted: 10/21/2004 7:28:37 AM | |
| P: 10/22/2004 3:46:06 AM | |
Garry H (Cut Nut) Ideal Rock Total Posts: 11,583 Last Post: 11/24/2009 Member Since: 8/16/2000 |
If you post all the info we can tell you more. DCLA are a very good lab. (I have a vested interest, but I have sold equipment to all the labs in Australia, so have no bias). Garry Holloway FGAA DipDT |
| Posted: 10/22/2004 3:46:06 AM | |
| P: 10/22/2004 4:48:58 AM | |
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atelier7 Rough Rock Total Posts: 20 Last Post: 11/11/2004 Member Since: 9/30/2004 |
Hi Garry, I guess I already know quite a bit about my diamond. Thanks to HCA and your reply to a post i made earlier. I think you said it may fall into current AGS0 but perhaps not so in the future. My question is whether one could reasonably rely on DCLA's gradings of "Very Good" to select a stone. How strict is DCLA to give a VG in proportion? Would another lab consider a girdle as "medium" and grade it "very good" when it was 3.5%? Or what about roundness: 1.6% being "very good"
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| Posted: 10/22/2004 4:48:58 AM | |
| P: 10/22/2004 4:52:00 AM | |
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atelier7 Rough Rock Total Posts: 20 Last Post: 11/11/2004 Member Since: 9/30/2004 |
These are the dimensions 0.718 Carats F, SI1 Diameter 5.72 Depth 3.54 or 61.9% Crown angle 35.5 Pavilion angle 40.9 Table 3.28 Cutlet 0.7 Girdle 3.5% HCA of 2.8 btw, I'm eagerly awaiting my ideal-scope kit to arrive!
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| Posted: 10/22/2004 4:52:00 AM | |
| P: 10/22/2004 5:39:57 AM | |
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Garry H (Cut Nut) Ideal Rock Total Posts: 11,583 Last Post: 11/24/2009 Member Since: 8/16/2000 |
DCLA measure girdle at the thicker part. That is medium to slightly thick  Very nice.AGS are going to do this too - so there will be no more warped diamonds. There should be a little leakage.  Garry Holloway FGAA DipDT |
| Posted: 10/22/2004 5:39:57 AM | |
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