[Most Recent Quotes from www.kitco.com]

Professional References and Charts:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Text Box: The Jewelry Doctor
Iris Rocker, AJP, (GIA)

Weight Comparison Chart for Platinum, Gold & Silver

 

Pt.

F.G.

22kt

18kt

14kt

10kt

9kt

F.S.

Stg

Pt.

1.00

0.90

0.82

0.70

0.60

0.53

0.53

0.49

0.48

F.G.

1.11

1.00

0.91

0.78

0.67

0.59

0.58

0.54

0.54

22kt

1.22

1.10

1.00

0.86

0.73

0.65

0.65

0.60

0.59

18kt

1.42

1.28

1.16

1.00

0.85

0.76

0.75

0.69

0.68

14kt

1.66

1.50

1.36

1.17

1.00

0.89

0.88

0.81

0.80

10kt

1.88

1.69

1.54

1.32

1.13

1.00

0.99

0.92

0.90

9kt

1.90

1.71

1.56

1.34

1.14

1.01

1.00

0.93

0.92

F.S.

2.04

1.84

1.68

1.44

1.23

1.09

1.08

1.00

0.99

Stg

2.07

1.87

1.70

1.46

1.25

1.11

1.09

1.01

1.00

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

Carat

Size

Round/Square

Brilliant/Princess

Pear

Marquis

Oval

Emerald

Heart

Trillion

0.25

4.1

 

6 x 3

5 x 3

5 x 3

4 x 4

4.4 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

5.0

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

15 x 9

 

11 x 9.5

 

10.5 x 10.5

 

5.00

11.20

 

16 x 8.5

12 x 10

12 x 10

11 x 11