Tanzanite
Tanzanite was unknown till 1967. It was discovered on the slopes of Kilimanjaro
at the foot of the Merelani Hills, Tanzania – the only place in the world to
mine Tanzanite.
Tanzanite is the name of the blue variety of the mineral Zoisite and
it is believed to be 600 million years old.
COLOUR GRADING
Tanzanite can show a dominance of
intensity of either Blue
or Violet
or a combination thereof. When
colour grading the dominant colour (HUE) of the stone will be mentioned last
e.g. Blue-Violet
(Violet being the dominant
colour) and Violet-Blue
(Blue being the dominant
colour).
There are five categories of
saturation (the strength of the hue). Vivid being the darkest colour on the
grading scale and pale being the lightest.
Each stone is carefully graded against the Grading Master Set to achieve the correct colour grade.
Tanzanite Grading Master Set
CLARITY
Clarity
- Refers to the imperfections that
may occur in the stone.
LC:
Loupe Clean
- No internal inclusions visible using 10x magnification. The stone may
have small abrasions that are invisible to the naked eye.
EC:
Eye Clean
- Minor internal inclusions and external abrasions not visible to the naked eye.
LI:
Lightly Included
- Minor noticeable inclusions that can be seen with the naked eye.
MI:
Moderately
Included - Larger
noticeable inclusions that can be easily seen with the naked eye and have a
negative affect on appearance.
HI:
Heavily Included
- Inclusions that cover majority of stone and have a serious affect on
appearance.
TANZANITE CERTIFICATE
We will provide full Certificate for
stones bigger than 0.50ct.
Picture of
Certificate
TANZANITE REPORT
A Report will be issued for stones less than
0.50ct.
Picture of Report
TANZANITE VERICARD
The tanzanite Vericard with the
stone’s weight and colour will be provided on customer’s request.
A tanzanite jewellery verification card will be issued for set
tanzanite pieces.
