Terry and Liz Jones
707-823-4487
theringman@theringman.com
PO Box 228
Sebastopol, Ca 95473
[Boxes with rings]
 

Gemstone Hardness
Amethyst 7
Ametrine 7
Apatite 6.5 to 7
Aquamarine 7.5 to 8
Blue Topaz 8
Citrine 7
Garnet 7 to 7.5
Iolite 7 to 7.5
Lapis Lazuli 5 to 6
Moonstone 6 to 6.5
Opal (blue-green) 5.5 to 6.5
Opal (white) 5.5 to 6.5
Peridot 6.5 to 7
Sapphire (blue-green) 9
Smoky Quartz 7
Tourmaline (green) 7 to 7.5
Tourmaline (pink) 7 to 7.5
White Topaz 8
Alexandrite
(lab-grown)		 8.5
Cubic Zirconia
(lab-grown)		 8.5
Emerald
(lab-grown)		 8
Ruby
(lab-grown)		 9
Month Birthstone
Modern Traditional
January Garnet Garnet
February Amethyst Amethyst
March Aquamarine Aquamarine
April Diamond Diamond
May Emerald Emerald
June Alexandrite Pearl or
Moonstone
July Ruby Ruby
August Peridot Sardonyx or
Peridot
September Sapphire Sapphire
October Opal or
Tourmaline		 Opal or
Tourmaline
November Citrine Topaz or
Smoky Quartz
December Blue Zircon or
Blue Topaz		 Turquoise or
Lapis Lazuli
 
Mons Scale of Hardness
1. Can be scratched easily with a fingernail Sulfur: 1-1.5
2. Can be scratched with a fingernail Amber: 2-3
Ivory: 2-4
3. Can be scratched with a coin Pearl: 3-4
Coral: 3-4
Malachite: 3.5-4
4. Can be scratched easily with a knife Rhodochrosite: 4
5. Can be scratched with a knife Lapis Lazuli: 5-6
Turquoise: 5-6
Opal: 5.5-6.5
6. Can be scratched with a steel file Moonstone: 6-6.5
Tanzanite: 6.5-7
Peridot: 6.5-7
Zircon: 6.5-7.5
7. Scratches glass and softer stones Citrine: 7
Amethyst: 7
Tourmaline: 7-7.5
Garnet: 7-7.5
Emerald: 7.5-8
8. Scratches glass and softer stones Topaz: 8
Alexandrite: 8.5
9. Scratches glass and softer stones Ruby: 9
Sapphire: 9
10. Scratches glass and softer stones Diamond: 10

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