Ammolite

Big Photo

Canada
6.27 carats
© gemselect.com

Ammolite is the fossilized shell of ammonites, which are composed primarily of aragonite or calcite.

Ammolite is typically used to create doublets or triplets that are suitable for making durable jewelry.

Ammolite is famous for its remarkably vivid play of colour, caused by lamellar structure of the glass-like shell.

Ammolite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 
 
 
 
 
 
 

Ammolite Gemstones by Size

This table shows distribution of Ammolite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:1.88 cts
Heaviest:23.51 cts
Average:11.28 cts
Total photos:39
Do you have a larger Ammolite? Why not upload a photo?
1.88ct to 4.04ct4.04ct to 6.21ct6.21ct to 8.37ct8.37ct to 10.53ct10.53ct to 12.70ct12.70ct to 14.86ct14.86ct to 17.02ct17.02ct to 19.18ct19.18ct to 21.35ct21.35ct to 23.51ct
Photos of natural/un-cut material from mindat.org
Physical Properties of Ammolite
Mohs Hardness4
Walter Schumann, Gemstones of the world (2001)
More from other references
Specific Gravity2.75 to 2.80
Walter Schumann, Gemstones of the world (2001)
More from other references
Optical Properties of Ammolite
Refractive Index1.520 to 1.670
Roger Dedeyn, Tables of Gemstone Identification (2007)
Birefringence0.150
Roger Dedeyn, Tables of Gemstone Identification (2007)
Colour
Colour (General)Play-of-color - mostly red-green mosaic-like
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Fluorescence & other light emissions
Fluorescence (General)Common mustard yellow
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Further Information
Mineral information:Ammolite information at mindat.org
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