New Faceted Blue 3.5 ct Topaz gemstone pendant with 14K GOLD list $398.00

Item Information

Dimensions (mm) 7 x 5 x 3mm
Weight (carats) 3.5 carats

New Faceted Blue 3.5 ct Topaz gemstone pendant with 14K GOLD list price $398.00

New Faceted Blue 3.5 ct
Topaz gemstone pendant 14K GOLD list price $398.00
7mm x 5mm x 3mm

What is Topaz?

Topaz is a rare silicate with a chemical composition

of Al2SiO4(F,OH)2.

It usually forms in fractures and cavities

 late in their cooling history.

 It is also found as water-worn pebbles in stream sediments derived from those igneous rocks.

Topaz is a well-known gemstone sold in a wide variety of attractive colors.

Some of these colors are natural, while others are produced by treating pale

or colorless topaz with heat, radiation, or metallic coatings.

Physical Properties of Topaz

Chemical ClassificationSilicate.
ColorNatural colors include: colorless, yellow, orange, red, pink, blue, green. Occurs in a wide range of treated colors, most often blue.
StreakColorless - harder than the streak plate.
DiaphaneityTranslucent to transparent.
CleavagePerfect basal cleavage.
Mohs Hardness8
Specific Gravity3.4 to 3.6
Diagnostic PropertiesHardness, prismatic crystals, sometimes striated, cleavage, specific gravity.
Chemical CompositionAl2SiO4(F,OH)2
Crystal SystemOrthorhombic.
UsesGemstone, Mohs hardness index mineral.

Physical Properties of Topaz

One of the best-known physical properties of topaz is its hardness. It has a hardness of 8  It also serves as the Mohs hardness scale index mineral for a hardness of 8. Every student who takes an introductory geology course learns about the hardness of topaz.

Most topaz is colorless or milky. Yellowish and brownish colors are also common. Natural pink, orange, red, purple, and blue topaz are rare and valuable if they are of  gem quality.

When allowed to grow unrestricted, topaz forms orthorhombic crystals, often with striations that parallel the long axis of the crystal. It also has a distinct basal cleavage that breaks perpendicular to the long axis of the crystal. This cleavage makes topaz a more fragile gemstone than its hardness of 8 would imply. Hardness is the resistance to being scratched, but the ability to resist breakage is a property known as tenacity.

Topaz has a specific gravity that ranges between 3.4 and 3.6. This is quite high for a mineral composed of aluminum, silicon, and gaseous elements.

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Pricing & Details

Auction ID 55549
Watchers 7 watching
Viewed 1,103 times
Starts 25th Apr 2017 12:34pm PDT

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