Shine Magazine - Allan Bros Jewellers

Cut
The cut of a diamond refers to its facets and proportions,
not just its shape. The proportions between the table, the
crown, the pavilion and the girdle are extremely important
in ensuring the radiance is maximised. For this reason,
sometimes cutting the diamond smaller to better its
proportions can make it more valuable.
Clarity
The more pure the clarity, the more brilliant the diamond
appears. Diamonds are graded according to their
combinations of minute mineral traces and crystal
dislocations called inclusions. Flawless diamonds are
extremely rare and valuable because the fewer the
inclusions, the less interference with the passage of light
(hence its greater sparkle).
CLARITY GRADING SCALE
Heavy Deep Cut Ideal Cut Light Shallow Cut
FL IF
VVSI-2 VSI-2 SI 1-2 I1 I2-3
DIAMOND TERMS
Table
THE EXPERT
Pavilion Crown
Culet
Girdle
When looking at the cut of a diamond, says
gemologist and diamond expert Tony Smallwood,
it’s all about “how the diamond performs”. Once
you’ve checked its specifications on the certificate,
this comes down to visual observation. “Look
at how ‘bright’ the diamond is - or, technically
speaking, how much light is ‘returned’ to the
viewer,” he explains. “Look also at how it ‘sparkles’
as it is moved, which is referred to as ‘scintillation’
- and how the flashes of ‘colour’ come out of a
stone, too - which, technically speaking, is the
diamond’s ‘dispersion’.”
Colour
The whiter the colour of the diamond, the greater its
capacity to reflect and refract light, and create a greater
brilliance. The highest quality diamonds are described as
colourless and are extremely rare. This, of course, makes
them very valuable. Jewellers grade a diamond’s colour on a
scale beginning with D (colourless) and moving through to Z.
Carat Weight
Carat is a term referring to the weight of a diamond and
not its size in dimensions. The weight of a diamond alone is
not all that is considered as a large stone is not particularly
valuable if it lacks high-grade colour, brilliance or clarity.
The size and shape of the “rough” diamond usually dictates
the “shape” of the final diamond produced.
GIA
COLOUR
GRADING
SCALE
D E F G H I J K L M N O P Q R S T U V W X Y Z
colourless near colourless faint yellow very light yellow
light yellow
Who knew?
The word diamond
comes from the Repair
Greek word ‘adámas’, Service
meaning ‘unbreakable’.
Jewellery
Care
Valuations
Only one polished
diamond out of a
thousand weighs
more than one carat.
Diamonds have
been treasured as
gemstones since their
use as religious icons
in ancient India.
Diamonds are often
brought to the earth’s
surface by deep
volcanic eruptions.
SHINE | ISSUE 1
19