Diamond and Precious Metal

The Four Cs – And why they're important for you

Every diamond is unique.
To calculate its value, experts refer to what they call the Four Cs--Colour, Clarity, Cut and Carat.
All of these factors will influence the eventual value of the diamond.

  • The Colour
  • The Clarity
  • The Cut
  • The Carat

Colour Grades used by Purely Diamonds

A diamond can divide light in to a spectrum of colours (like a prism). Colour in a diamond acts like a filter and diminishes the spectrum of colours emitted. The less colour in the diamond, the better the colour grade.

The scale for grading ranges from D which is totally colourless, to Z which is a pale yellow or brown colour. Diamonds that are 'colourless' (graded D, E or F) are very rare and demand premium prices. The untrained eye will find it very difficult to distinguish between D, E or F grades.

G, H, I and J are 'near colourless' and represent excellent value for money. G and H are sometimes called 'rare white' and are the most sought after in the 'near colourless' group.

The majority of diamonds we use are colour 'G' or above. As you can see, colour G is the 4th highest colour and top of the 'near colourless' group. This grade represents great value for money, as 'colourless' stones can be very expensive (less than 2% of all diamonds are graded as colour D).

Diamond Shapes

Round Brilliant Cut Diamond

This shape accounts for over 75% of all diamonds sold today. Round is the most popular shape used for engagement rings. It's 58 facet-cut achieves the maximum brilliance a diamond can have, maximising the reflection and refraction of light.

Princess (Square) Cut Diamond

This is one of the most popular fancy-shaped diamonds and is popular for engagement rings. The princess cut is essentially a square version of the round brilliant cut, known technically as a square modified brilliant cut.

Emerald Cut Diamond

An emerald cut diamond can be extremely stunning. It may not have the sparkle of a round brilliant cut, but because of its long lines it tends to produce more dramatic flashes of light.

Radiant Cut Diamond

This shape is a cross between a princess and an emerald cut. It combines the best features of the round brilliant cut, the elegance and trimmed corners of an emerald cut and a squarer shape more similar to the princess cut.

This shape is a variation of the round brilliant cut - elongated with pointed ends. This shape can maximise carat-weight, making the diamond appear much larger, and tends to make your fingers appear long and slender.

Pear Shape Diamond

Pear shaped diamonds are often called 'teardrop' diamonds. This shape is a combination of the round brilliant and the marquise, a fiery cut with elegant lines and lots of sparkle.

Asscher Cut Diamond

The asscher cut is often referred to as the 'square emerald cut' - because it is square with wide step facets and cropped corners. This cut is designed to draw your eye into the stone.

Baguette/Tapered Baguette Diamond

Baguette cut diamonds are oblong/rectangular, and are similar to emerald cuts but without the cut corners

Diamond Chart

ROUND DIAMONDS

Carat Weight

Size (mm)

0.005
0.0065
0.0075
0.01
0.0125
0.015
0.0175
0.02
0.025
0.03
0.035
0.04
0.05
0.055
0.06
0.065
0.07
0.08
0.09
0.10
0.11
0.12
0.13
0.14
0.15
0.16
0.18
0.20
0.22
0.23
0.25
0.27
0.30
0.33
0.36
0.38
0.40
0.45
0.47
0.50
0.60
0.65
0.75
0.85
0.90-1.00
1.00-1.25

1.00
1.10
1.20
1.30
1.40
1.50
1.60
1.65
1.80
1.90
2.00
2.10
2.20
2.30
2.40
2.50
2.60
2.70
2.80
2.90
3.00
3.10
3.20
3.30
3.40
3.50
3.60
3.70
3.80
3.90
4.00
4.10
4.20
4.30
4.40
4.50
4.60
4.70
4.80
5.00
5.25
5.50
5.75
5.90
6.00
6.50


PRINCESS (SQUARE) DIAMONDS

Carat Weight

Size (mm)

0.015
0.0175
0.02
0.025
0.03
0.04
0.045
0.05
0.06
0.065
0.07
0.08
0.10
0.11
0.12
0.13
0.14
0.15
0.18
0.20
0.22
0.25
0.27
0.30
0.33
0.35
0.40
0.43
0.45
0.47
0.50
0.55
0.60
0.70
1.00

1.30
1.40
1.50
1.60
1.65
1.80
1.90
2.00
2.10
2.20
2.30
2.40
2.50
2.60
2.70
2.80
2.90
3.00
3.10
3.20
3.30
3.40
3.50
3.60
3.70
3.80
3.90
4.00
4.10
4.20
4.30
4.40
4.50
4.80
5.50


EMERALD CUT DIAMONDS

Carat Weight

Size (mm)

0.20
0.25
0.30
0.33
0.40
0.50
0.60
0.70
1.00

3.90 x 2.95
4.50 x 2.90
4.60 x 3.20
4.60 x 3.50
5.00 x 3.70
5.20 x 4.00
5.60 x 4.10
6.50 x 4.50
7.00 x 5.00


MARQUISE DIAMONDS

Carat Weight

Size (mm)

0.25
0.40
0.50
0.60
0.70

6.00 x 3.00
7.00 x 4.00
8.00 x 4.00
8.00 x 5.00
9.00 x 4.50


PEAR SHAPED DIAMONDS

Carat Weight

Size (mm)

0.20
0.25
0.33
0.40
0.50
0.70

4.50 x 3.40
4.80 x 3.50
5.60 x 3.85
5.70 x 4.20
6.40 x 4.50
7.50 x 4.60



Metal Education

-Platinum

Our platinum is 950 Platinum. (950)
Platinum is the finest precious metal used in jewellery making
Platinum is very rare and found in only a few places around the world
Platinum is naturally white, does not tarnish and does not need to be rhodium-plated
Platinum does scratch, like all other precious metals, but it is hard-wearing

-White gold

Our white gold is 18-carat. (750)
White gold is coated in rhodium-plating to make it appear white
White gold and platinum look almost identical when new
White gold needs to be re-plated once per year on average to keep it white

-Yellow gold

Our yellow gold is 18-carat. (750)
Yellow gold does not require plating as it is naturally yellow
Yellow gold is hard wearing and will maintain its yellow colour