Diamond Proportions
|
Diamond Shapes |
Diamond Weight |
Diamond Proportions |
Diamond Color |
Diamond Clarity
Interesting Diamonds facts
AGA Accredited Gem Appraisers Cut Grading Chart for Round Brilliant Cut
| |
Hearts & Arrows Ideal Cut |
American Ideal Cut |
International Fine Trade Cut |
US domestic Average Cut |
Below Average Cut |
| Cut classes |
Phenomenon |
Class 1A |
Class 1B |
Class 2A |
Class 2B |
Class 3A |
Class 3B |
Class 4A |
Class 4B |
Table, %
53%-63% are weght specific in 1A, 1B, 2A grades |
<=.49ct |
<=.49ct |
<=.49ct |
<=.49ct |
all weights |
all weights |
all weights |
all weights |
all weights |
| 53-57.5 |
53-59 |
59.1-62
52.9-52 |
62.1-63
51.9-51.5 |
63.1-64
51.4-51 |
64.1-67
50.9-50.5 |
67.1-70
50.4-50 |
70.1-72
49.9-49 |
>72
<49 |
| >=.50ct |
>=.50ct |
>=.50ct |
>=.50ct |
| 53-58 |
53-58 |
58.1-60
52.9-52 |
60.1-63
51.9-51.5 |
| Crown angle, ° |
34.3-34.7 |
34.3-34.7 |
34-34.2
34.8-35 |
32.1-33.9
35.1-35.8 |
31.6-32
35.9-36.4 |
31.5-30.1
36.5-37.9 |
29.6-30
38-39.4 |
29-29.5
39.5-40.5 |
<29
>40.5 |
| Crown height, % |
<=.49ct |
<=.49ct |
<=.49ct |
<=.49ct |
all weights |
all weights |
all weights |
all weights |
all weights |
| 14-16.3 |
14-16.3 |
12.8-13.9
or
16.4-16.8 |
11.6-12.7
or
16.9-17.9 |
11.1-11.5
or
18.0-18.1 |
9.6-11
or
18.2-19.3 |
8.5-9.5
or
19.4-20.5 |
7.8-8.4
or
20.6-21.8 |
<7.8
or
>21.8 |
| >=.50ct |
>=.50ct |
>=.50ct |
>=.50ct |
| 14.3-16.3 |
14.3-16.3 |
13.5-14.2
or
16.4-16.8 |
11.6-13.4
or
16.9-17.9 |
| Pavilion Depth, % |
42.8-43.2 |
42.8-43.2 |
42.5-42.7
43.3-43.5 |
42-42.4
43.6-44 |
41.5-49
44.1-44.9 |
41-41.4
45-45.5 |
40.5-40.9
45.6-46 |
38-40.4
46.1-48 |
<38
>48 |
Girdle Thikness, %
Word description and percentages |
Thin, Medium, Slightly thick
1.7-3 |
Slightly thin to slightly thick
1.5-4.5 |
Thin to slightly thick
1-4.5 |
Thin to thick
1-5.5 |
Very thin to very thick
0.4-7 |
Extra thin to extra thick
0-7 |
Total Depth, %
Determined by factors already considered above |
58.7-62.3 |
58.7-62.3 |
58.3-58.69
62.31-62.99 |
57.9-58.29
63-63.5 |
57.5-57.89
63.51-63.8 |
57-57.46
63.81-64.1 |
56.5-56.99
64.11-65 |
55-56.49
65.1-67 |
<55
>67 |
| Polish/Symmetry |
Excellent |
Excellent or Very Good |
Excellent to Good |
Good or Fair |
Poor |
Stock Diamond Search
80 000 Diamonds online
Negotiable prices Just Ask!
|
Original Diamonds perfectly cut Hearts and Arrows Diamonds
(
Social Networks
Jason Withers
group on Facebook