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Calibrated Size
» Calibrated Size Comparison Chart
Calibrated Size Charts for Gemstones to be set in Standard Jewelry Mountings
Oval Cut
Calibrated Size Chart for Standard Jewelry Mountings
(approximate weights)
Size in mm
Weight in carat
5x3
6x4
7x5
8x6
9x7
10x8
11x9
12x10
14x12
Alexandrite
.30
.51
.80
1.45
2.00
3.60
4.25
6.00
8.90
Amethyst
.23
.45
.85
1.25
1.75
2.40
3.20
4.50
6.50
Aquamarine
.20
.40
.75
1.10
1.75
2.25
3.00
4.50
6.75
Citrine
.23
.45
.85
1.25
1.75
2.40
3.25
4.20
5.20
Diamond
.25
.50
.75
1.40
2.00
3.00
4.00
5.00
8.00
Emerald
.25
.52
.85
1.26
1.90
2.60
3.75
5.00
7.50
Pyrope Garnet
.25
.55
1.00
1.40
2.10
2.80
3.75
5.00
7.00
Iolite
.21
.40
.63
1.02
-
-
-
-
-
Opal
.16
.28
.47
.78
1.10
1.65
2.15
3.00
4.00
Peridot
.28
.50
.95
1.35
2.00
2.50
3.50
4.00
6.00
Ruby
.35
.60
1.06
1.55
2.20
3.15
3.80
6.00
7.25
Sapphire
.35
.60
1.00
1.55
2.20
3.15
3.80
6.00
7.25
Tanzanite
.20
.48
.89
1.35
-
-
-
-
-
Topaz
.28
.57
1.10
1.60
2.50
3.50
4.50
6.00
8.80
Tourmaline
.25
.50
.90
1.18
2.30
2.90
3.50
5.25
6.80
Tsavorite
.28
.52
.75
-
-
-
-
-
-
Zircon
.40
.75
1.45
2.00
2.85
4.00
5.60
7.50
8.20
Round Cut
Calibrated Size Chart for Standard Jewelry Mountings
(approximate weights)
Size in mm
Weight in carat
2
3
4
5
6
6.5
7
8
10
Alexandrite
.04
.12
.35
.63
1.30
1.86
2.15
2.90
5.20
Amethyst
.04
.10
.20
.40
.70
1.10
1.30
1.80
3.30
Aquamarine
.04
.10
.25
.45
.75
1.31
1.60
2.40
3.50
Citrine
.04
.10
.20
.40
.70
1.10
1.30
1.80
3.30
Diamond
.03
.10
.23
.47
.80
1.00
1.25
1.90
3.50
Emerald
.04
.12
.27
.48
.80
1.26
1.70
2.50
6.10
Pyrope Garnet
.05
.13
.30
.60
1.00
1.40
1.60
2.50
5.75
Opal
.02
.09
.16
.34
.57
.75
.83
1.30
2.00
Peridot
.05
.12
.26
.50
.85
1.11
1.25
2.00
5.25
Ruby
.05
.15
.34
.65
1.05
1.41
1.60
2.25
4.50
Sapphire
.05
.15
.34
.65
1.05
1.41
1.60
2.25
4.50
Topaz
.04
.11
.30
.56
1.00
1.36
1.55
2.50
5.75
Tourmaline
.04
.12
.24
.45
.75
1.28
1.55
2.00
3.00
Zircon
.06
.17
.36
.69
1.25
1.58
1.75
2.60
5.00
Pear Cut
Calibrated Size Chart for Standard Jewelry Mountings
(approximate weights)
Size in mm
Weight in carat
5x3
6x4
7x5
8x6
9x6
10x7
12x8
14x9
Alexandrite
.30
.50
.85
1.10
2.10
3.60
6.60
8.80
Amethyst
.20
.35
.65
.85
1.25
1.70
4.00
5.00
Aquamarine
.20
.35
.65
.90
1.30
1.85
4.20
5.60
Citrine
.20
.35
.65
.85
1.30
1.70
4.00
5.00
Diamond
.25
.50
.75
1.00
1.50
2.00
3.50
5.00
Emerald
.25
.45
.70
1.05
1.70
2.60
4.15
6.10
Pyrope Garnet
.25
.40
1.00
1.15
1.30
1.80
3.50
5.80
Opal
.13
.22
.35
.50
.70
1.03
1.40
2.45
Peridot
.25
.45
.70
.80
1.10
1.40
3.40
4.75
Ruby
.30
.50
.75
1.00
1.85
2.50
4.75
7.90
Sapphire
.30
.50
.75
1.00
1.85
2.50
4.75
7.90
Topaz
.25
.50
1.00
1.10
2.00
3.50
6.50
8.50
Tourmaline
.35
.45
.60
.90
1.10
1.40
2.80
6.75
Zircon
.30
.70
1.00
1.30
2.60
4.00
5.25
7.50
Octagon / Emerald Cut
Calibrated Size Chart for Standard Jewelry Mountings
(approximate weights)
Size in mm
Weight in carat
5x3
6x4
7x5
8x6
9x7
10x8
11x9
12x10
14x12
Alexandrite
.40
.70
1.30
2.60
3.60
4.20
6.00
8.50
9.90
Amethyst
.35
.55
1.10
1.60
2.25
2.90
4.20
5.60
7.25
Aquamarine
.25
.50
.80
1.40
2.00
3.00
4.30
4.75
7.75
Citrine
.35
.55
1.00
1.60
2.25
2.90
4.20
5.60
7.25
Diamond
.25
.50
1.00
1.50
3.00
4.00
5.00
7.80
8.80
Emerald
.30
.60
.90
1.80
2.31
3.15
4.50
5.25
5.80
Pyrope Garnet
.40
.80
1.20
1.70
2.50
3.50
4.30
6.35
9.00
Peridot
.35
.60
1.00
1.70
2.25
3.80
5.25
6.25
8.80
Ruby
.55
.75
1.15
1.60
2.30
2.75
4.00
6.25
9.00
Sapphire
.55
.75
1.15
1.75
2.30
2.75
4.00
6.25
9.00
Topaz
.40
.65
1.25
2.40
3.40
4.00
5.75
8.00
9.50
Tourmaline
.30
.60
1.60
2.15
2.80
3.60
4.30
5.20
8.50
Zircon
.60
.85
1.70
2.35
3.90
450
6.20
7.01
8.95
Marquise Cut
Calibrated Size Chart for Standard Jewelry Mountings
(approximate weights)
Size in mm
Weight in carat
4x2
5x3
6x3
7x3.5
8x4
10x5
12x6
14x7
Alexandrite
.07
.20
.30
.50
.70
1.25
2.10
3.50
Amethyst
.10
.15
.20
.34
.48
.90
1.59
2.45
Aquamarine
.08
.14
.20
.25
.50
.80
1.50
2.75
Citrine
.10
.15
.20
.35
.50
.90
1.59
2.45
Diamond
.12
.18
.25
.37
.50
1.00
2.00
3.00
Emerald
.09
.19
.30
.45
.60
1.40
1.80
2.80
Pyrope Garnet
.09
.16
.25
.42
.60
1.20
2.00
2.85
Opal
.09
.13
.17
.27
.37
.59
1.00
1.25
Peridot
.10
.17
.25
.37
.50
1.00
2.00
2.55
Ruby
.13
.24
.35
.55
.75
1.15
2.20
3.00
Sapphire
.13
.24
.35
.55
.75
1.15
2.20
3.00
Topaz
.07
.17
.30
.50
.70
1.20
2.00
3.40
Tourmaline
.10
.20
.30
.45
.60
.85
1.55
2.20
Zircon
.13
.23
.33
.55
.75
1.25
1.95
3.00
Items: 0 | Total: $0.00
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Agate
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Amazonite
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Azotic Topaz
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Citrine
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Demantoid Garnet
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Mystic Quartz
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Opal Doublet
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Paraiba Tourmaline
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Pearl
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Tiger's Eye
Tiger's Eye Matrix
Topaz
Tourmaline
Tsavorite Garnet
Turquoise
Verdite
Zircon
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Agate
•
Agate Geode
•
Alexandrite
•
Almandine Garnet
•
Amazonite
•
Amber
•
Amethyst
•
Ametrine
•
Andalusite
•
Andesine Labradorite
•
Apatite
•
Aquamarine
•
Aventurine
•
Axinite
•
Azotic Topaz
•
Beryl
•
Bloodstone
•
Boulder Opal
•
Carnelian
•
Cat's Eye Apatite
•
Cat's Eye Diaspore
•
Cat's Eye Scapolite
•
Chalcedony
•
Charoite
•
Chrome Diopside
•
Chrome Tourmaline
•
Chrysoberyl
•
Chrysoberyl Cat's Eye
•
Chrysocolla
•
Chrysoprase
•
Citrine
•
Clinohumite
•
Color-Change Diaspore
•
Color-Change Garnet
•
Color-Change Sapphire
•
Coral
•
Demantoid Garnet
•
Dendritic Agate
•
Emerald
•
Fire Agate
•
Fire Opal
•
Fluorite
•
Fossil Coral
•
Gaspeite
•
Grossularite Garnet
•
Hematite
•
Hemimorphite
•
Hessonite Garnet
•
Idocrase
•
Iolite
•
Jadeite
•
Jasper
•
Kunzite
•
Kyanite
•
Labradorite
•
Lapis Lazuli
•
Larimar
•
Lepidolite
•
Malachite
•
Maw-Sit-Sit
•
Moonstone
•
Morganite
•
Mystic Quartz
•
Mystic Topaz
•
Nuumite
•
Obsidian
•
Onyx
•
Opal
•
Opal Doublet
•
Orthoclase
•
Paraiba Tourmaline
•
Peanut Wood
•
Pearl
•
Peridot
•
Prehnite
•
Pyrope Garnet
•
Quartz
•
Quartz Cat's Eye
•
Rainbow Moonstone
•
Rhodochrosite
•
Rhodolite Garnet
•
Rose Quartz
•
Rubellite Tourmaline
•
Ruby
•
Ruby-Zoisite
•
Rutile Quartz
•
Sapphire
•
Scapolite
•
Seraphinite
•
Sillimanite Cat's Eye
•
Smoky Quartz
•
Snowflake Obsidian
•
Sodalite
•
Spessartite Garnet
•
Sphalerite
•
Sphene
•
Spinel
•
Spodumene
•
Star Diopside
•
Star Garnet
•
Star Moonstone
•
Star Rose Quartz
•
Star Ruby
•
Star Sapphire
•
Star Sunstone
•
Strawberry Quartz
•
Sugilite
•
Sunstone
•
Tanzanite
•
Tashmarine Diopside
•
Tiger's Eye
•
Tiger's Eye Matrix
•
Topaz
•
Tourmaline
•
Tsavorite Garnet
•
Turquoise
•
Verdite
•
Zircon
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