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Manufacturers, Importer &  Exporter of  Precious, Semi-Precious Stones, Stone Beads & Sterling Silver Jewellery since 1985.

 

<%=request.querystring("itemgroup") %> WEIGHT CHART OF GEMSTONE -- Kotawala's Creation

WEIGHT CHART OF GEMSTONE (Approximate Weight in Carats)
Oval-"mm" 4*3 5*3 5*4 6*4 7*5 8*6 9*7 10*8 11*9 12*10 14*10 16*12 18*13
Amethyst/Citrine 0.15 0.21 0.33 0.45 0.76 1.10 1.60 2.40 3.20 4.10 6.20 11.00 14.00
Aquamarine 0.16 0.22 0.34 0.42 0.61 1.00 1.50 2.30 3.00 4.00 6.10 10.70 13.60
Emerald 0.17 0.25 0.35 0.47 0.75 1.10 1.65 2.40 3.50 4.50 7.50    
Diamond 0.17 0.25 0.37 0.50 0.75 1.40 2.00 3.00 4.00 5.00 8.00    
Garnet 0.22 0.27 0.40 0.55 1.00 1.40 2.10 2.80 3.70 5.00 7.10 12.00 15.20
Opal 0.10 0.16 0.22 0.28 0.47 0.78 1.10 1.60 2.10 3.00 4.00 5.20 6.75
Peridot 6.17 0.25 0.38 0.50 0.76 1.40 2.00 2.70 3.50 4.50 6.40 9.50 13.00
Ruby/Sapphire 0.24 0.31 0.50 0.60 1.00 1.60 2.20 3.40 4.60 5.40 7.20 12.00 17.50
Topaz 0.21 0.27 0.42 0.57 0.85 1.50 2.00 3.20 4.40 5.00 6.80 11.26 16.50
Tourmaline 0.15 0.25 0.37 0.50 0.75 1.20 2.30 2.90 3.50 4.70 6.30 11.10 14.00
Zircon 0.25 0.40 0.55 0.75 1.20 2.00 2.90 4.00 5.40 7.20 8.80 14.50 19.50

WEIGHT CHART OF GEMSTONE  (Approximate Weight in Carats)
Round-"mm" 2 2.5 3 3.5 4 5 6 7 8 9 10
Amethyst/Citrine 0.03 0.05 0.10 0.15 0.24 0.40 0.70 1.10 1.80 2.55 3.30
Aquamarine 0.03 0.05 0.08 0.15 0.22 0.40 0.42 1.20 2.00 2.75 3.50
Emerald 0.03 0.06 0.10 0.17 0.26 0.52 0.95 1.50 2.20 2.95 3.75
Diamond 0.04 0.07 0.10 0.17 0.23 0.50 0.90 1.40 1.90 3.05 4.25
Garnet 0.04 0.07 0.11 0.23 0.31 0.56 1.00 1.60 2.20 2.75 4.15
Opal 0.02 0.04 0.06 0.11 0.16 0.34 0.57 0.83 1.40 1.95 2.55
Peridot 0.03 0.05 0.11 0.15 0.30 0.53 0.85 1.20 2.00 2.39 4.38
Ruby/Sapphire 0.05 0.09 0.14 0.22 0.38 0.65 1.20 1.80 2.40 3.45 4.50
Topaz 0.04 0.09 0.11 0.20 0.34 0.56 1.00 1.50 2.00 3.30 4.40
Tourmaline 0.04 0.08 0.12 0.17 0.25 0.45 0.8 1.30 2.00 2.60 3.35
Zircon 0.06 0.10 0.16 0.26 0.40 0.69 1.40 2.00 2.80 3.60 4.80

WEIGHT CHART OF GEMSTONE  (Approximate Weight in Carats)
Octagon-"mm" 5x3 6*4 7*5 8*6 9*7 10*8 11*9 12*10 14*10 16*12 18*13
Amethyst/Citrine 0.27 0.55 0.95 1.50 2.30 3.00 4.20 5.60 7.60 10.50 17.00
Aquamarine 0.28 0.53 1.00 1.60 2.40 3.10 4.30 5.80 7.90 10.90 17.00
Emerald 0.32 0.60 1.00 1.75 2.50 3.30 4.50 5.80 8.00 11.00 17.00
Diamond 0.25 0.50 1.00 1.60 2.70 4.00 5.00 6.70 9.00 13.00 19.50
Garnet 0.34 0.68 1.10 1.70 2.70 3.70 4.80 6.40 8.50 15.50 21.00
Opal 0.27 0.55 0.95 1.50 2.30 3.00 4.20 5.60 7.60 10.50 17.00
Peridot 0.33 0.60 1.00 1.60 2.50 3.50 4.80 6.30 8.80 13.00 19.00
Ruby/Sapphire 0.45 0.75 1.20 1.75 2.90 4.00 6.00 7.30 9.90 16.50 22.00
Topaz 0.35 0.65 1.10 1.70 2.60 3.80 5.20 7.00 9.10 14.00 20.00
Tourmaline 0.30 0.60 1.00 1.60 2.50 3.50 4.60 6.20 8.70 13.00 18.50
Zircon 0.44 0.85 1.40 2.40 3.50 4.70 6.60 8.00 11.40 18.30 26.00

BIRTHSTONES
and what They Signify
MONTH GEMSTONE SIGNIFICANCE
January Garnet Constancy
February Amethyst Sincerity
March Aquamarine Wisdom
April Diamond Innocence
May Emerald Love
June Alexandrite Wealth
July Ruby Freedom
August Peridot Friendship
September Sapphire Truth
October Tourmaline Hope
November Golden Topaz Loyalty
December Blue Zircon Success

ANTWERP DIAMOND SIEVE SIZES
Plate Size No of Stones per Carat Weight MM
Size
0 200 1/2pt

1.10-

1
11/2
2
21/2
3

 175
150
125
110/115
100

1pt

 1.15
1.20
1.25
1.30
1.35

31/2
4
41/2
5
51/2

90
80
70
60
50

2pt

1.40
1.45
1.50
1.55
1.60

6
61/2
7
71/2

48
45
35
33

3pt

1.70
1.80
1.90
2.00

8
81/2

30
25

4pt

2.10
2.20

9
91/2

22
20

5pt

2.30
2.40

10
101/2
11

18
17
16

6/7pt

2.50
2.60
2.70

111/2
12

15
13

7/8pt

2.80
2.90

121/2

11

9 pt

3.00

13

10

10pt

3.10

131/2

8/9

11 pt

3.20

14

8

12 pt

3.30

141/2

7.5

13 pt

3.40

15

6.5

15 pt

3.50

151/2