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AJS Gems Gem Library- All about Gemstone Weight Chart, Blue sapphire, pink sapphires, red gemstone, Burmese rubies, Burma ruby, tourmaline, pink tourmalines

Gemstone Library
AJS Gemstone Weight Chart
Round Faceted
Blue Sapphire 2 mm 3 mm 4 mm 5 mm 6 mm 6.5 mm 7 mm 8 mm 10 mm
Alexandrite .04 ct .12 ct .35 ct .63 ct 1.30 ct 1.86 ct 2.15 ct 2.90 ct 5.20 ct
Amethyst .04 ct .10 ct .20 ct .40 ct .70 ct 1.10 ct 1.30 ct 1.80 ct 3.30 ct
Aquamarine .04 ct .10 ct .25 ct .45 ct .75 ct 1.31 ct 1.60 ct 2.40 ct 3.50 ct
Citrine .04 ct .10 ct .20 ct .40 ct .70 ct 1.10 ct 1.30 ct 1.80 ct 3.30 ct
Diamond .03 ct .10 ct .23 ct .47 ct .80 ct 1.00 ct 1.25 ct 1.90 ct 3.50 ct
Emerald .04 ct .12 ct .27 ct .48 ct .80 ct 1.26 ct 1.70 ct 2.50 ct 6.10 ct
Garnet .05 ct .13 ct .30 ct .60 ct 1.00 ct 1.40 ct 1.60 ct 2.50 ct 5.75 ct
Opal .02 ct .09 ct .16 ct .34 ct .57 ct .75 ct .83 ct 1.30 ct 2.00 ct
Peridot .05 ct .12 ct .26 ct .50 ct .85 ct 1.11 ct 1.25 ct 2.00 ct 5.25 ct
Ruby .05 ct .15 ct .34 ct .65 ct 1.05 ct 1.41 ct 1.60 ct 2.25 ct 4.50 ct
Sapphire .05 ct .15 ct .34 ct .65 ct 1.05 ct 1.41 ct 1.60 ct 2.25 ct 4.50 ct
Topaz .04 ct .11 ct .30 ct .56 ct 1.00 ct 1.36 ct 1.55 ct 2.50 ct 5.75 ct
Tourmaline .04 ct .12 ct .24 ct .45 ct .75 ct 1.28 ct 1.55 ct 2.00 ct 3.00 ct
Zircon .06 ct .17 ct .36 ct .69 ct 1.25 ct 1.58 ct 1.75 ct 2.60 ct 5.00 ct
Oval Faceted
Burma Ruby 5x3 mm 6x4 mm 7x5 mm 8x6 mm 9x7 mm 10x8 mm 11x9 mm 12x10 mm 14x10 mm
Alexandrite .30 ct .51 ct .80 ct 1.45 ct 2.00 ct 3.60 ct 4.25 ct 6.00 ct 8.90 ct
Amethyst .23 ct .45 ct .85 ct 1.25 ct 1.75 ct 2.40 ct 3.20 ct 4.50 ct 6.50 ct
Aquamarine .20 ct .40 ct .75 ct 1.10 ct 1.75 ct 2.25 ct 3.00 ct 4.50 ct 6.75 ct
Citrine .23 ct .45 ct .85 ct 1.25 ct 1.75 ct 2.40 ct 3.25 ct 4.20 ct 5.20 ct
Diamond .25 ct .50 ct .75 ct 1.40 ct 2.00 ct 3.00 ct 4.00 ct 5.00 ct 8.00 ct
Emerald .25 ct .52 ct .85 ct 1.26 ct 1.90 ct 2.60 ct 3.75 ct 5.00 ct 7.50 ct
Garnet,
Mozambique		 .25 ct .55 ct 1.00 ct 1.40 ct 2.10 ct 2.80 ct 3.75 ct 5.00 ct 7.00 ct
Garnet,
Rhodolite		 .25 ct .55 ct 1.00 ct 1.40 ct 2.10 ct 2.80 ct - - -
Iolite .21 ct .40 ct .63 ct 1.02 ct - - - - -
Opal .16 ct .28 ct .47 ct .78 ct 1.10 ct 1.65 ct 2.15 ct 3.00 ct 4.00 ct
Peridot .28 ct .50 ct .95 ct 1.35 ct 2.00 ct 2.50 ct 3.50 ct 4.00 ct 6.00 ct
Ruby .35 ct .60 ct 1.06 ct 1.55 ct 2.20 ct 3.15 ct 3.80 ct 6.00 ct 7.25 ct
Sapphire .35 ct .60 ct 1.00 ct 1.55 ct 2.20 ct 3.15 ct 3.80 ct 6.00 ct 7.25 ct
Tanzanite .20 ct .48 ct .89 ct 1.35 ct - - - - -
Topaz .28 ct .57 ct 1.10 ct 1.60 ct 2.50 ct 3.50 ct 4.50 ct 6.00 ct 8.80 ct
Tourmaline .25 ct .50 ct .90 ct 1.18 ct 2.30 ct 2.90 ct 3.50 ct 5.25 ct 6.80 ct
Tsavorite .28 ct .52 ct .75 ct - - - - - -
Zircon .40 ct .75 ct 1.45 ct 2.00 ct 2.85 ct 4.00 ct 5.60 ct 7.50 ct 8.20 ct
Pear Faceted
Pink Sapphire 5x3 mm 6x4 mm 7x5 mm 8x6 mm 9x6 mm 10x7 mm 12x8 mm 14x9 mm
 Alexandrite .30 ct .50 ct .85 ct 1.10 ct 2.10 ct 3.60 ct 6.60ct 8.80ct
Amethyst .20 ct .35 ct .65 ct .85 ct 1.25 ct 1.70 ct 4.00 ct 5.00 ct
Aquamarine .20 ct .35 ct .65 ct .90 ct 1.30 ct 1.85ct 4.20ct 5.60ct
Citrine .20 ct .35 ct .65 ct .85 ct 1.30 ct 1.70 ct 4.00ct 5.00ct
Diamond .25 ct .50 ct .75 ct 1.00 ct 1.50 ct 2.00 ct 3.50 ct 5.00ct
Emerald .25 ct .45 ct .70 ct 1.05 ct 1.70ct 2.60ct 4.15ct 6.10ct
Garnet .25 ct .40 ct 1.00 ct 1.15 ct 1.30 ct 1.80ct 3.50ct 5.80ct
Opal .13 ct .22 ct .35 ct .50 ct .70 ct 1.03 ct 1.40ct 2.45ct
Peridot .25 ct .45 ct .70 ct .80 ct 1.10 ct 1.40 ct 3.40ct 4.75ct
Ruby .30 ct .50 ct .75 ct 1.00 ct 1.85 ct 2.50ct 4.75ct 7.90ct
Sapphire .30 ct .50 ct .75 ct 1.00 ct 1.85 ct 2.50ct 4.75ct 7.90ct
Topaz .25 ct .50 ct 1.00 ct 1.10 ct 2.00 ct 3.50 ct 6.50ct 8.50ct
Tourmaline .35 ct .45 ct .60 ct .90 ct 1.10 ct 1.40 ct 2.80 ct 6.75ct
Zircon .30 ct .70 ct 1.00 ct 1.30 ct 2.60 ct 4.00 ct 5.25 ct 7.50ct
Marquise Faceted
Beryl 4x2 mm 5x3 mm 6x3 mm 7x3.5 mm 8x 4mm 10x5 mm 12x6 mm 14x7 mm
Alexandrite .07 ct .20 ct .30 ct .50 ct .70 ct 1.25 ct 2.10 ct 3.50 ct
Amethyst .10 ct .15 ct .20 ct .34 ct .48 ct .90 ct 1.59 ct 2.45 ct
Aquamarine .08 ct .14 ct .20 ct .25 ct .50 ct .80 ct 1.50 ct 2.75 ct
Citrine .10 ct .15 ct .20 ct .35 ct .50 ct .90 ct 1.59 ct 2.45 ct
Diamond .12 ct .18 ct .25 ct .37 ct .50 ct 1.00 ct 2.00 ct 3.00 ct
Emerald .09 ct .19 ct .30 ct .45 ct .60 ct 1.40 ct 1.80 ct 2.80 ct
Garnet .09 ct .16 ct .25 ct .42 ct .60 ct 1.20 ct 2.00 ct 2.85 ct
Opal .09 ct .13 ct .17 ct .27 ct .37 ct .59 ct 1.00 ct 1.25 ct
Peridot .10 ct .17 ct .25 ct .37 ct .50 ct 1.00 ct 2.00 ct 2.55 ct
Ruby .13 ct .24 ct .35 ct .55 ct .75 ct 1.15 ct 2.20 ct 3.00 ct
Sapphire .13 ct .24 ct .35 ct .55 ct .75 ct 1.15 ct 2.20 ct 3.00 ct
Topaz .07 ct .17 ct .30 ct .50 ct .70 ct 1.20 ct 2.00 ct 3.40 ct
Tourmaline .10 ct .20 ct .30 ct .45 ct .60 ct .85 ct 1.55 ct 2.20 ct
Zircon .13 ct .23 ct .33 ct .55 ct .75 ct 1.25 ct 1.95 ct 3.00 ct
Octagon Faceted
Red Tourmaline 5x3 mm 6x4 mm 7x5 mm 8x6 mm 9x7 mm 10x8 mm 11x9 mm 12x10 mm 14x10 mm
Alexandrite .40 ct .70 ct 1.30 ct 2.60 ct 3.60 ct 4.20 ct 6.00 ct 8.50 ct 9.90 ct
Amethyst .35 ct .55 ct 1.00 ct 1.60 ct 2.25 ct 2.90 ct 4.20 ct 5.60 ct 7.25 ct
Aquamarine .25 ct .50 ct .80 ct 1.40 ct 2.00 ct 3.00 ct 4.30 ct 4.75 ct 7.75 ct
Citrine .35 ct .55 ct 1.00 ct 1.60 ct 2.25 ct 2.90 ct 4.20 ct 5.60 ct 7.25 ct
Diamond .25 ct .50 ct 1.00 ct 1.50 ct 3.00 ct 4.00 ct 5.00 ct 7.80 ct 8.80 ct
Emerald .30 ct .60 ct .90 ct 1.80 ct 2.31 ct 3.15 ct 4.50 ct 5.25 ct 5.80 ct
Garnet .40 ct .80 ct 1.20 ct 1.70 ct 2.50 ct 3.50 ct 4.30 ct 6.35 ct 9.00 ct
Peridot .35 ct .60 ct 1.00 ct 1.70 ct 2.25 ct 3.80 ct 5.25 ct 6.25 ct 8.80 ct
Ruby .55 ct .75 ct 1.15 ct 1.60 ct 2.30 ct 2.75 ct 4.00 ct 6.25 ct 9.00 ct
Sapphire .55 ct .75 ct 1.15 ct 1.75 ct 2.30 ct 2.75 ct 4.00 ct 6.25 ct 9.00 ct
Topaz .40 ct .65 ct 1.25 ct 2.40 ct 3.40 ct 4.00 ct 5.75 ct 8.00 ct 9.50 ct
Tourmaline .30 ct .60 ct 1.60 ct 2.15 ct 2.80 ct 3.60 ct 4.30 ct 5.20 ct 8.50 ct
Zircon .60 ct .85 ct 1.70 ct 2.35 ct 3.90 ct 4.50 ct 6.20 ct 7.01 ct 8.95 ct

Color
Gemstone Cut
Gemstone Shape
Gemstone Glossary
Proper Care of Gemstones 		Hardness
Refractive Index
Crystal Structure
Density
Chemical Composition 		Gemstome Weight Chart
Metric to Inch Conversion Chart
Diamond Weight Chart
Gemstones & Zodiac
Recommended Gem Books 		Ruby
Sapphire
Tourmaline
Other Gemstones


 

Green Blue Green * Blue Pink Star * Blue Sapphire * Black Star Sapphire * Cabochon Sapphire * Fancy Color Change * Pink Sapphire * Padparadscha Orange * Yellow Sapphire * Burma Ruby * Cabochon Ruby * Star Ruby * Blue Blue Green * Cats Eye Tourmaline * Bi Color Tourmaline * Chrome Tourmaline * Fancy Tourmaline * Green Tourmaline * Paraiba Tourmaline * Pink Tourmaline * Rubellite Tourmaline * Color Change Garnet * Demantoid Garnet * Mali Garnet * Rhodolite Garnet * Mandarin Garnet Spessartite * Tsavorite Garnet * Blue Zircon * Honey Red Zircon * White Zircon * Aquamarine * Yellow Beryl * Goshenite * Green Beryl * Morganite * Alexandrite * Cats Eye Chrysoberyl * Chrysoberyls * Vanadium Chrysoberyl * Amethyst * Ametrine * Citrine * Green Quartz * Cats Eye Citrine * Chalcedony * Amblygonite * Apatite * Astrophillite * Carving * Chrome Diopside * Danburite * Eudialyte * Fluorite * Color Change Fluorite * Idocrase * Jadeite Jade * Kunzite * Moonstone * Opal * Mexican Opal * Opalite Cats Eye * Pearl * Peridot * Petalite * Scapolite * Sphene * Spinel * Sunstone * Tanzanite * Topaz * Imperial Topaz * Actinolite Cats Eye * Prehnite * Rhodonite * 

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