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Diamonds Hong Kong

Looking for a Diamond or Diamond ring in Hong Kong




Jason Withers
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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
<=.49ctOriginal Diamonds <=.49ct <=.49ct <=.49ct all weights all weights all weights all weights all weights
53-57.5Original Diamonds 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
>=.50ctOriginal Diamonds >=.50ct >=.50ct >=.50ct
53-58Original Diamonds 53-58 58.1-60
52.9-52
60.1-63
51.9-51.5
Crown angle, ° 34.3-34.7Original Diamonds 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, % <=.49ctOriginal Diamonds <=.49ct <=.49ct <=.49ct all weights all weights all weights all weights all weights
14-16.3Original Diamonds 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
>=.50ctOriginal Diamonds >=.50ct >=.50ct >=.50ct
14.3-16.3Original Diamonds 14.3-16.3 13.5-14.2
or
16.4-16.8
11.6-13.4
or
16.9-17.9
Pavilion Depth, % 42.8-43.2Original Diamonds 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
1.7-3Original Diamonds
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
58.7-62.3Original Diamonds 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 ExcellentOriginal Diamonds Excellent or Very Good Excellent to Good Good or Fair Poor

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Jason Withers Diamonds

Gemologist, Diamond grader Master Jewellery designer, 149 Wickham Tce Brisbane 4000 | ph: +61 (07) 3839 4088
Diamond Rings Sydney Brisbane,Diamond Rings Studio Sydney City 407/350 George Street, Sydney NSW 2000 | ph: +61 (02) 9119 6488


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