Diamond Guide

Choosing a diamond or any precious stone is an important decision, all stones are defined by it's Shape, Cut, Clarity, Carat, and Colour which are known as the four "C’s". We are advocates of using diamonds which have an above average balance of cut, clarity and colour. 

CUT

Refers to the angles and proportions of the stone.

Based on scientific formulas, a well-cut diamond will internally reflect light from one mirror-like facet to another and disperse and reflect it through the top of the stone. This results in a display of brilliance and fire, thereby placing well-cut diamonds higher on the Diamond Quality Pyramid than deep or shallow-cut diamonds. Diamonds that are cut too deep or too shallow lose or leak light through the side or bottom, resulting in less brilliance and ultimately, value.

Cut also refers to shape—round, square, pear, or heart for example. Since a round diamond is symmetrical and capable of reflecting nearly all the light that enters, it is the most brilliant of all diamond shapes and follows specific proportional guidelines. Ask a jeweller to find out more about these guidelines. Non-round shapes, also known as "fancy shapes," will have their own guidelines to be considered well-cut.

 

 

CLARITY

Refers to the presence of inclusions in a diamond. Inclusions are natural identifying characteristics such as minerals or fractures, appearing when the stones are formed in the earth. They may look like tiny crystals, clouds or feathers. The greater the clarity, the better the colour and therefore the more expensive.

FL - Flawless

IF - Internally Flawless

VVS1 - Very Very Slight Inclusions (Visible under a microscope)

VVS2 - Very, Very Slight Inclusions 

VS1 - Very Slight Inclusions (Visible by loupe)

VS2 - Very Slight Inclusions

SI - Slight Inclusions (Visible by eye)

S2 - Slight Inclusions

I1,I2,I3 - Included (Imperfect) 

 

 

CARAT

Refers to the weight of a diamond or precious stone.

 

COLOUR

Refers to the degree to which a diamond is colourless. Diamonds range in colour and are graded in a colour scale, which ranges from D (colourless) to Z. Colour differences are very subtle and it is very difficult to see the difference between, say, an E and an F. Colour, however, ultimately comes down to personal taste and the budget. When you start to think about buying a diamond or precious stone you would naturally want value for money. Before you call us we recommend that you have a good look around and always ask about the four C’s. This way you will have a good idea of what you don’t like and what you want to spend. You may find a design you like but you would prefer it to be handmade and that is where we can help. Should you have "no idea" what you want then that is fine too. We have endless ideas and are happy to spend some time with you discussing what would be a good option for you. We will always have our rings independently valued on completion and our price will always be less than that value.

 

 

SHAPE

Displayed below are ten of the most common shapes diamonds are cut into. Round (Brilliant), Emerald, Marquise, Radiant, Heart, Princess, Asscher, Oval, Pear and Cushion.

 

 

Diamond Carat to mm Conversion Chart

 

Carat
Round
Princess
Pear
Emerald
Heart
0.05ct
2.4 mm
1.8  x  1.8
3.0 x 2.0 
-
-
0.10ct
3.0 mm
2.5 x 2.5
4.0 x 2.5
3.0 x 2.0
3.0 x 3.0
0.15ct
3.4 mm
2.8 x 2.8
4.5 x 3.0
3.5 x 2.5
3.5 x 3.5
0.20ct
3.8 mm
3.0 x 3.0
5.0 x 3.5
-
3.5 x 3.5
0.25ct
4.1 mm
3.3 x 3.3
5.5 x 3.5
4.5 x 3.5
4.0 x 4.0
0.30ct
4.2 mm
3.7 x 3.7
-
-
-
0.35ct
4.5 mm
3.8 x 3.8
6.5 x 3.5
5.0 x 3.0
4.5 x 4.5
0.40ct
4.8 mm
4.0 x 4.0
6.5 x 4.5
-
-
0.50ct
5.2 mm
4.5 x 4.5
7.0 x 4.5
5.5 x 4.5
5.0 x 5.0
0.60ct
5.4 mm
4.7 x 4.7
-
-
-
0.65ct
5.6 mm
-
7.5 x 4.5
-
5.5 x 5.5
0.75ct
5.8 mm
5.0 x 5.0
8.0 x 5.0
6.0 x 4.0
6.0 x 6.0
0.85ct
6.2 mm
-
8.5 x 5.0
6.5 x 5.0
-
1.00ct
6.5 mm
6.0 x 6.0
9.0 x 5.5
7.0 x 5.0
6.5 x 6.5
1.25ct
7.0 mm
-
9.5 x 6.0
-
-
1.50ct
7.4 mm
6.5 x 6.5
10.0 x 6.0
8.0 x 6.0
7.0 x 7.0
1.75ct
7.8 mm
-
10.5 x 6.5
-
7.5 x 7.5
2.00ct
8.2 mm
7.0 x 7.0
11.0 x 7.0
8.5 x 6.0
8.0 x 8.0
2.25ct
8.6 mm
-
11.5 x 7.0
-
-
2.50ct
8.8 mm
7.5 x 7.5
12.0 x 7.5
9.0 x 7.0
8.5 x 8.5
2.75ct
9.1 mm
-
12.5 x 7.5
-
-
3.00ct
9.4 mm
8.0 x 8.0
12.5 x 8.0
10.0 x 8.0
9.0 x 9.0

 

*This is only a general guide of diamond sizes, all stones should be measured for accuracy.