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Gemstone Information Center
Actinolite Cat's Eye
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Bi Color Tourmaline
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Buying Gemstones
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Canada
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China
Chinese
Chocolate Opal
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Chrysoberyl Cat's Eye
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Collectors
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Cushion Cut Gems
Cushion Shapes
Cut
Danburite
December Birthstones
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Demantoid Garnet
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Diamond Cut
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Diffusion Treatment
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Disclosure
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Dominican Republic Gems
Doublet
Dreams
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Drilled Gemstones
Drusy
Druzy Azurite
Dumortierite Quartz
Emerald
Emerald Cut
English
Engraving
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Epidote
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Fancy Color
Fancy Cut Amethyst
Fancy Cut Gems
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February Birthstones
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Fossil Coral
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Fuchsite
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Green
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Grossularite
Grossularite Garnet
Group
Gypsum
Hackmanite
Hambergite
Hawk's Eye
Healing
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Heat Treatment
Hematite
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Hessonite Garnet
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Hiddenite
History Of Gems
Hornblende
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India
Investing
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Italian
Jacinth
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January Birthstones
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Kyanite Cabochons
Labradoresence
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Language
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Lemon Quartz
Lepidolite
List
Lithium Gems
London Blue
Lots
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Madagascar
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Mali Garnet
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Melee
Mexico
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Mogok Ruby
Mohs
Moissanite
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Morganite
Moss Opal
Mother Of Pearl
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Multicolor
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Natural Gemstones
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Nephrite Jade
New Arrivals
Nickel
Nigeria Tourmaline
Nigerian Gems
Non Fracture Filled Ruby
Nuumite
Obsidian
Octagon
Omphacite Jade
Onyx
Opal
Opal Doublet
Orange
Organic Gemstones
Origin
Orthoclase
Oval
Padparadscha
Padparadscha Sapphire
Pailin
Pairs
Pakistan Gems
Palladium
Paraiba
Paste Gemstones
Peanut Wood
Pear Shapes
Pearl
Pectolite
Peridot
Peridot Pairs
Pezzottaite
Phenomenal Gems
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Pink Gemstones
Pink Sapphire
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Play Of Color
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Portuguese Cut
Portuguese Cut Tourmaline
Prasiolite
Precious
Prehnite
Price
Princess-cut Gems
Purple Gemstones
Pyrite
Pyrope Garnet
Quartz
Quartz Cat's Eye
Rainbow Moonstone
Rainbow Pyrite
Rare Gems
Red
Red Spinel
Refractive Index
Rhodochrosite
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Rocks And Gemstones
Rose
Rose Cut
Rose Quartz
Round Shapes
Rubellite Tourmaline
Ruby
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Ruby In Fuchsite
Ruby-Zoisite
Russian
Russian Gems
Rutile
Rutile Quartz
Rutile Topaz
Sapphire
Sapphire Cabochon
Sapphire Hearts
Sardonyx
Saturation
Scapolite
Scintillation
Scissor Cut
Selenite
Semi-precious
Seraphinite
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Shape
Sillimanite
Sillimanite Cat's Eye
Silver
Simulant
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Slice
Smithsonite
Smoky Quartz
Snowflake Obsidian
Sodalite
Songea Sapphires
South Africa
Spanish
Specific Gravity
Spessartite
Sphalerite
Sphene
Sphere
Spinel
Spodumene
Square
Sri Lankan Gems
Star Diopside
Star Garnet
Star Gemstones
Star Lemon Quartz
Star Moonstone
Star Rose Quartz
Star Ruby
Star Sapphire
Star Sunstone
Strawberry Quartz
Sudan Gemstones
Sugilite
Sunstone
Swiss Blue
Synthetic Gems
Taaffeite
Tanzania
Tanzanite
Tashmarine Diopside
Tavernier
Tektite
Thailand
Tiger's Eye
Tiger's Eye Matrix
Top Grade Gems
Topaz
Tourmaline
Treatment
Tremolite-Hexagonite
Trillion
Trillion Shapes
Trust
Tsavorite Garnet
Turkish Gems
Turquoise
Unakite
Unheated Sapphire
United States
Untreated
Untreated Gems
Uruguay
Uvarovite
Uvarovite Garnet Drusy
Valentine
Value Gems
Variscite
Verdite
Violet Gemstones
Watermelon Tourmaline
White Gemstones
Yellow
Zambian Gems
Zimbabwe Gems
Zircon
Zoisite
Zultanite
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart