˹á
ǡѺ
4Cs ͧྪ ФǡѺ ྪ ǹྪ
ྪǧ ྪ乷ѧ鹵͹
ǹྪ ǹྪ ¤ྪ ¢ྪ ҧྪ ྪ ǹͧ
 ྪҤҾ ྪҤҶ١
дҹ -ͺ ͺءѭͧ ྪ ǹྪ ǹྪ
١Ңͧ
Ἱ ŢԴ
ҧҹҧʴ֧ кèѴسҾ (Cut Grade) ͧ Accredited Gem Appraisers (AGA) Ѻྪ (Round Brilliant Cut) 觡ù͡ 8 дѺ (Ũҡ AGA)

 

CUT CLASSES

Class1A

Class1B

Class 2A

Class 2B

 

American Ideal Cut

International fine trade cut

Table % (Ҵ)

53-58%

52-60%

51.5-63%

51-64%

Crown angle (ǹ)

34.0-34.7

33-35.1

32.1-35.8

31.6-36.4

 Crown height % (٧ǹ)

14-16.3%

13.5-16.8%

11.6-17.9%

11.1-18.1%

Pavilion Depth% (֡¹)

42.8-43.2%

42.5-43.5%

42-44%

41.5-44.9%

Girdle Thickness:
˹ (ͺྪ)

Thin to Medium(1.0% to 3.0%)
Medium to Slightly thick (1.7% to 4.5%)

Very thin to Slightly thick (0.4% to 4.5%)
Thin to Slightly thick (1.0% to 4.5%)

Very thin to Slightly thick(0.4% to 4.5%)

Very thin to Thick(0.4% to 5.5%)

Total depth %

Ѵǹ֡

58-62.3%

58.3-62.99%

<58.3%
>63%

Polish/Symmetry

ѡ

Excellent -Very Good

Excellent toGood

 

CUT CLASSES

Class 3A

Class 3B

Class 4A

Class 4B

 

US domestic average cut

below average

Table % (Ҵ)

50.5-67%

50-70%

49-72%

>72%
<49%

Crown angle (ǹ)

30.1-37.9

29.6-39.4

29-40.5

<29
>40.5

Crown height % (٧ǹ)

9.6-19.3%

8.5-20.5%

7.8-21.8%

<7.8%
>21.8%

Pavilion Depth % (֡¹)

41-45.5%

40.5-46%

38-48%

<38%
>48%

Girdle Thickness:
˹ (ͺྪ)

Very thin to Very thick (0.4% to 7.0%)

Extremely thin to Extremely thick (0.0% to >7.0%)

Total depth % (֡)

<58.3%
>63%

Polish/Symmetry

ѡ

Good -Fair

Poor

 

˵بҡѡѭʵ (Gemologist): Cut Class ͧ AGA ѺкûԹسҾ (Grading System) ͧ GIA, HRD IGI Ѻ
 
 

ѷ Թ๪ ӡѴ
99 ٹäʾҹҴ, M, ͧ M26, Ѫɡ,
ǧԹᴧ, ࢵԹᴧ, ا෾ 10400
: (02) 660-9200, 660-9201 ῡ: (02) 660-9202
: geleediamond@hotmail.com


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