Mystic Topaz | Gemopedia

Sometimes, man's imagination is able to create things that even Mother Nature couldn't dream of. With its dazzling kaleidoscope of colors, mystic topaz first appeared in September 1998 at the Hong Kong Jewelry Fair, but it took a few years for designers and high-end jewelry manufacturers to realize its unquestionable charm. Mystic topaz begins with a natural topaz gemstone that was created millions of years ago, that is then made even more beautiful and desirable with the assistance of modern technology. The chemical vapor deposition (CVD) process deposits a thin film onto part of the surface of a white topaz gem, creating an eye-catching rainbow effect as light passes through the gem, which results in an unbelievable array of colors.
Colors
Various Colors

Mystic Topaz Classification

Common Name

Mystic Topaz

Species

Topaz

Variety

Mystic Topaz

Colors

Various Colors

Alternate Names

Gemstone Groups

Key Separations

refractive index, birefringence, optic character; possibly specific gravity. Some topaz is coated, causing an inert reaction to LWUV and SWUV, different spectra and variable reactions to a CCF test.

Comments

Stones are Chemical Vapor Deposition treated with titanium and other metals to produce a range of colors. Biaxial positive common point is 0.001 from low RISurface treated green stones: RI 1.609 to 1.617

Mystic Topaz Optical Properties

Transparency

Transparent

Refractive Index

1.609-1.617

Birefringence

0.008-0.01

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: weak fire Value: 0.014

Comments

Mystic Topaz Chemistry & Crystallography

Chemical Name

aluminium silicate fluoride hydroxide plus titanium coating

Chemical Formula

Al2(F,OH)2SiO4 + Ti coating

Synthesis

Crystal System

Orthorhombic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Mystic Topaz Characteristic Physical Properties

Hardness

8

Streak

Specific Gravity

3.49-3.57 Typical:3.53

Toughness

Good

Inclusions

Mystic topaz is a type II clarity stone. Stones have a coating on the pavilion or crown of stone There might scratches of treated surface of the stone that show colorless areas underneath. Stones sometimes contain long tube-like cavities containing liquid, healed fractures and areas that look like they are starting to cleave. Stones might include 2-phase and 3-phase inclusions some of which contain more than one liquid that have not been mixed. Surface treated green topaz is blue green in appearance and looks spotty there might also be blue color concentrations in surface reaching fractures.

Luster

Vitreous

Stability

Fair

Fracture

Conchoidal

Cleavage

Perfect, in one direction

Comments

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