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Diameter: The width of the diamond as measured through the girdle.

Table: The largest facet of a gemstone.

Crown: The top portion of a diamond extending from the girdle to the table.

Girdle: The narrow band around the widest part of a diamond.

Pavilion: The bottom portion of a diamond, extending from the girdle to the culet.

Culet: The facet at the tip of a gemstone. The preferred culet is not visible with the unaided eye (graded "small" or "none").

Depth: The height of a gemstone measured from the culet to the 

 

     

 

Diamond Sieve Size Chart/s- sizes indicated may vary plus or minus 10%

 
     

 

Plate Size

# of Stones per Carat

Weight

MM Size

.

Plate Size

# of Stones per Carat

Weight

MM Size

.

Plate Size

# of Stones per Carat

Weight

MM Size

 

 

000

.

.

1.00

6½

45

.

1.80

13½

8/9

11 pt.

3.20

 

 

00

.

.

1.05

7

35

.

1.90

14

8

12 pt.

3.3.

 

 

0

200

½ pt.

1.10

7½

33

3 pt.

2.00

14½

7.5

13 pt.

3.40

 

 

1

175

.

1.15

8

30

.

2.10

15

6.5

15 pt.

3.50

 

 

1½

150

.

1.20

8½

25

4 pt.

2.20

15½

6

17 pt.

3.60

 

 

2

125

.

1.25

9

22

.

2.30

16

5.5

18 pt.

3.70

 

 

2½

110/115

.

1.30

9½

20

5 pt.

2.40

16½

5.25

19 pt.

3.80

 

 

3

100

1 pt.

1.35

10

18

.

2.50

17

4.75

21 pt.

3.90

 

 

3½

90

.

1.40

10½

17

.

2.60

17½

4.5

22 pt.

4.00

 

 

4

80

.

1.45

11

16

6/7 pt.

2.70

18

4.25

23 pt.

4.10

 

 

4½

70

.

1.50

11½

15

.

2.80

18½

4

25 pt.

4.20

 

 

5

60

.

1.55

12

13

7/8 pt.

2.90

19

3.70

27 pt.

4.30

 

 

5½

50

2 pt.

1.60

12½

11

9 pt.

3.00

19½

3.33

30 pt.

4.40

 


 
Note :  1) Stars   Small polished diamonds, generally sold between sieve sizes + 000 to -6.5
           2) Melee, Melée, Mêlée   Small diamonds, generally sold between sieve sizes + 6.5 to -11  


 

Clarity Grading Scales
(for diamonds 0.46 carats and above)

GIA 

AGS 

CIBJO
IDC

SCAN.D.N.

F
 Flawless

0

F
 Flawless

LC
Loupe Clean

IF
 Internally Flawless

1

IF

IF

VVS1
 Very Very Slightly Included 1

VVS1

VVS1

VVS2
 Very Very Slightly Included 2

2

VVS2

VVS2

VS1
 Very Slightly Included 1

3

VS1

VS1

VS2
 Very Slightly Included 2

4

VS2

VS2

SI1
 Slightly Included 1

5

SI1

SI1

SI2
 Slightly Included 2

6

SI2

SI2

SI3
 Slightly Included 3

I1
 Included 1

7-8

P1
 Pique 1

P1
 Pique 1

I2
 Included 2

 8-9

P2
 Pique 2

P2
 Pique 2

I3
 Included 3

 9-10

P3
 Pique 3

P3
 Pique 3


Millimeter (mm) to Carat (ct) Gemstone Conversion Chart

Carat Size

Round/Square
Brilliant/Princess

Pear

Marquise

Oval

Emerald

Heart

Trillion

0.25

4.1

 

6 x 3

5 x 3

5 x 3

4 x 4

4.5 x 4.5 x 4.5

0.50

5.2

6 x 4

8 x 4

6 x 4

6 x 4

5 x 5

6 x 6 x 6

0.75

5.8

7 x 5

9 x 4.5

 

6.5 x 4.5

6 x 6

 

1.00

6.5

8 x 5

10 x 5

7 x 5

7 x 5

6.5 x 6.5

 

1.25

7.0

 

 

7.5 x 5.5

 

 

 

1.50

7.4

9 x 6

11 x 5.5

8 x 6

8 x 6

7 x 7

7 x 7 x 7

2.00

8.2

10 x 7

12 x 6

8.5 x 6.5

8.5 x 6.5

8 x 8

8 x 8 x 8

2.50

8.8

12 x 7

13 x 6.5

9 x 7

9 x 7

8.5 x 8.5

9 x 9 x 9

3.00

9.4

12 x 8

14 x 7

10 x 8

10 x 8

9 x 9

10 x 10 x 10

3.50

10.0

13 x 8

14 x 7.5

10 x 8.5

 

9.5 x 9.5

 

4.00

10.04

14 x 8

16 x 8

11 x 9

11 x 9

10 x 10

 

4.50

10.80

14.5 x 9

 

11 x 9.5

 

10.5 x 10.5

 

5.00

11.20

15 x 9

16 x 8.5

12 x 10

12 x 10

11 x 11

 

 

International Ring Size Chart

United States and Canada Ring Size

Diameter in Inches

Great Britain

France

Germany

Japan

Switzerland

000

0.390

---

---

---

---

---

00

0.422

---

---

---

---

---

0

0.454

---

---

---

---

---

½

0.462

A

---

---

---

---

¾

0.471

A-½