Imperial Topaz (A variety of topaz of orange, pinkish colours.)

Big Photo

Imperial Topaz
6.02 carats
© johndyergems.com

Traditionally Imperial Topaz was orange in colour with red dichroism. Today the definition has expanded to include colors like pinks, reds, lavender pinks and peach pinks but usually excludes yellow or brown.

Some Imperial Topaz stones can fade on exposure to sunlight for an extended period of time.

Imperial Topaz Gemstones by Colour

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

Imperial Topaz Gemstones by Size

This table shows distribution of Imperial Topaz 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:1.55 cts
Heaviest:159.14 cts
Average:17.54 cts
Total photos:21
Do you have a larger Imperial Topaz? Why not upload a photo?
1.55ct to 17.31ct17.31ct to 33.07ct33.07ct to 48.83ct48.83ct to 64.59ct64.59ct to 80.35ct80.35ct to 96.10ct96.10ct to 111.86ct111.86ct to 127.62ct127.62ct to 143.38ct143.38ct to 159.14ct
General Information
A variety or type of:Topaz
Physical Properties of Imperial Topaz
Mohs Hardness8
Walter Schumann, Gemstones of the world (2001)
Specific Gravity3.49 to 3.57
Walter Schumann, Gemstones of the world (2001)
Cleavage QualityPerfect
Walter Schumann, Gemstones of the world (2001)
FractureUneven,Conchoidal
Walter Schumann, Gemstones of the world (2001)
Optical Properties of Imperial Topaz
Refractive Index1.609 to 1.643
Walter Schumann, Gemstones of the world (2001)
Birefringence0.008 to 0.016
Walter Schumann, Gemstones of the world (2001)
PleochroismYellow: definite - lemon-honey, straw-yellow; Red: strong - dark red, yellow, pink-red
Walter Schumann, Gemstones of the world (2001)
Dispersion0.014
Walter Schumann, Gemstones of the world (2001)
Colour
Colour (General)Orange, pink, red, lavender pink and peach pink
Management Team, gemdat.org (2012)
TransparencyTransparent,Translucent
Walter Schumann, Gemstones of the world (2001)
Fluorescence & other light emissions
Fluorescence (General)Pink: weak - brown; Red: weak - yellow-brown; Yellow: weak - orange-yellow
Walter Schumann, Gemstones of the world (2001)
Crystallography of Imperial Topaz
Crystal SystemOrthorhombic
Walter Schumann, Gemstones of the world (2001)
HabitPrismatic
Walter Schumann, Gemstones of the world (2001)
Further Information
Mineral information:Imperial Topaz information at mindat.org
Significant Gem Localities
Brazil
 
  • Minas Gerais
Mossman (2001)
      • Rodrigo Silva district
Russia
 
  • Chelyabinsk Oblast
Copyright © Jolyon & Katya Ralph 1993-2018. Site Map. Locality, gem & photograph data are the copyright of the individuals who submitted them. For more information please contact the . Gemdat.org is an online information resource dedicated to providing free gemmological information to all.