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Deciding on a diamond

Diamonds are the most precious and enduring of all gemstones and they have long been the ultimate token of love. All diamonds are judged on their own individual qualities. We believe there are 6 factors to consider when choosing a diamond. On this page we explain more about each point of choice, and provide some handy charts.


Diamonds are available in a variety of differently shaped cuts.

Round shaped diamond


The round brillinat cut diamond is by far the most popular choice worldwide. In 1919 Russian mathematician Tolkowsky calculated the theoretical proportions for this specific cut in such a way that 100% reflection (sparkle) is obtained. All round brilliant diamonds are polished according to these proportions. This classic shape is perfect for a diamond engagement ring or any other piece of jewellery. The round brilliant has been fashionable in the past, is fashionable today and will always be fashionable in the future. It remains a popular first choice.

Princess shaped diamond


The princess cut is fast becoming one of the most popular fancy shaped diamonds today. The face-up shape of the princess cut is square and its side profile is an inverted pyramid. Its unique shape and pointed corners put it in a different class thena other shapes. Its unique, defining look is distinguishable from other shapes.

Emerald shaped diamond


With its large pavilion in the lower half, the emerald cut shaped diamond has a unique style. Due to the large table it highlights the clarity of the diamond. Its rectangular shape sets it apart from other shapes in such a way that it is easily identifiable with the naked eye.

Oval shaped diamond


At first sight an oval cut diamond looks quite similar to a round brilliant. However, when looking at it more closely, one can see that it has longer sides and two sharper corners. When considering a ring this shape is excellent for a person who has long, slender fingers.

Marquise shaped diamond


The marquise cut is a traditional shaped diamond which can be described as the "skinny" brother of the oval. This shape enhances the diamond's brilliant if it is surrounded by other shaped smaller diamonds. Carat for carat this unique shape has one of the largest crowns (upper half), making it a good choice to maximise the perceived size.

Pear shaped diamond


The pear, also known as the tear drop, is a traditionally shaped diamond which becomes wide as opposed to longer when the carat increases. This shape is more popular in pendants and earrings.

Cushion shaped diamond


The cushion-cut diamond is a square cut with rounded corners, much like a pillow (hence the name). This classic cut has been around for almost 200 years. It was the most popular shape in its first century of existence (much like the round brilliant today).


Carat (ct) is the term given to the weight of a gemstone. Generally speaking the larger (heavier) the diamond, the more expensive it will be, however it is possible to purchase a larger diamond for less than a smaller one, provided a compromise is made with colour, clarity and cut.

  1. 0.25 carat

    0.25 Ct

  2. 0.5 carat

    0.5 Ct

  3. 0.75 carat

    0.75 Ct

  4. 1 carat

    1 Ct

  5. 1.5 carat

    1.5 Ct

  6. 2 carat

    2 Ct

  7. 3 carat

    3 Ct

  8. 4 carat

    4 Ct

  9. 5 carat

    5 Ct


Diamonds come in many different shades of colour. From totally white (D) to fancy yellow, green, pink or blue. Purchasing a diamond that has been certified by the GIA or HRD laboratories guarantees the colour, clarity, carat weight and cut.

Certified diamonds are usually slightly more expensive than non-certified stones. Diamonds as small as 0.25 carat are now available with certificates. Smaller diamonds set in eternity rings etcetra are not usually certified. Our standard non-certified diamond quality used in or rings and earrings is G colour and VS purity.

  1. Colourless diamond

    D - F


  2. Near colourless diamond

    G - J

    Near colourless

  3. Faint yellow diamond

    K - M

    Faint yellow

  4. Very light yellow diamond

    N - R

    Very light yellow

  5. Light yellow diamond

    S - Z

    Light yellow


When a rough diamond is found it has spent millions of years evolving in the Earth. Nature is rarely perfect and a totally flawless diamond (IF) is a very rare thing. Most diamonds contain small natural imperfections called inclusions. These imperfections are graded and this partly determines a diamonds value. A diamond that has been certified by the GIA or HRD laboratories guarantees the clarity for that stone.

Internally flawless (IF) diamond

Internally flawless (IF)

No inclusions are visible to a skilled grader at 10x magnification.

Very, very small inclusions (VVS1, VVS2) diamond

Very, very small inclusions (VVS1, VVS2)

Minute inclusions, which are extremely difficult for a skilled grader to see at 10x magnification.

Very small inclusions (VS1, VS2) diamond

Very small inclusions (VS1, VS2)

Minute inclusions that are difficult for a skilled grader to see at 10x magnification and are invisible to the naked eye.

Small inclusions (SI1, SI2, SI3) diamond

Small inclusions (SI1, SI2, SI3)

Inclusions are visible under 10x magnification and might be visible to the naked eye (particularly in the case of SI3).

Inclusions (I1, I2, I3) diamond

Inclusions (I1, I2, I3)

Obvious inclusions are visible to the naked eye and these may affect transparency and brilliance.


The cut refers to the make of the diamond. All brilliant-cut diamonds have 52 facets or edges. Two diamonds of the same weight can look different in size. One might look dull compared to another. This is due to its cut. Certificated diamonds will detail the type of cut and symmetry.

Too shallow

Too shallow



Too deep

Too deep


This is the term given to a natural characteristic that occurs in some diamonds.

Under a UV light some diamonds will show a fluorescence.

This again can have an influence on the diamonds value.


By blending colour, clarity, cut and carat a diamond can be chosen that will fit any budget. With diamonds, size is not everything! However, the more money spent, the greater the choice in balancing quality and size of diamond.

Video Guide

The following 10 minute video from GIA further explains the above concepts.

Is it hallmarked?

Since the Hallmarking Act of 1974, all our jewellery has been independantly hallmarked by the British Hallmarking Council. This gives you the purchaser a guarantee of the quality and type of precious metal in our jewellery. All our jewellery carries our own Sponsors mark, Assay Office mark, Date mark, Common Control Mark and Metal Fineness mark.

Make sure before you buy jewellery that it has a proper independant hallmark like ours, otherwise you may not be buying what you think it is.

Hallmark Guide

Finger Size Guide

A 37.83 0.25 12.03 A ½ 38.42 0.5 12.22
B 39.02 0.75 12.41 B ½ 39.67 1 12.61
C 40.22 1.25 12.8 C ½ 40.82 1.5 12.99
D 41.42 1.75 13.18 D ½ 42.02 2 13.37
E 42.61 2.25 13.56 E ½ 43.27 2.5 13.75
F 43.81 2.75 13.94 F ½ 44.41 3 14.13
G 45.01 3.25 14.32 G ½ 45.61 3.5 14.51
H 46.2 3.75 14.7 H ½ 46.8 4 14.89
I 47.4 4.25 15.08 I ½ 48 4.5 15.27
J 48.6 4.75 15.46 J ½ 49.2 5 15.65
K 49.77 5.25 15.83 K ½ 50.39 5.5 16.03
L 50.99 5.75 16.22 L ½ 51.59 6 16.41
M 52.19 6.25 16.61 M ½ 52.79 6.5 16.8
N 53.47 6.75 17.01 N ½ 54.1 7 17.21
O 54.74 7 17.42 O ½ 55.38 7.25 17.62
P 56.02 7.5 17.82 P ½ 56.66 7.75 18.03
Q 57.3 8 18.23 Q ½ 57.95 8.25 18.43
R 58.57 8.5 18.64 R ½ 59.21 8.75 18.84
S 59.85 9 19.04 S ½ 60.49 9.25 19.25
T 61.13 9.5 19.45 T ½ 61.77 9.75 19.65
U 62.4 10 19.86 U ½ 63.04 10.25 20.06
V 63.68 10.5 20.26 V ½ 64.32 10.75 20.47
W 64.88 11 20.64 W ½ 65.48 11.25 20.83
X 66.07 11.5 21.02 X ½ 66.67 11.75 21.21
Y 67.27 12 21.41 Y ½ 67.87 12.25 21.6
Z 68.47 12.5 21.79 Z ½ 69.09 12.75 21.99

Anniversaries and Dates

JanuaryGarnetDark red
MarchAquamarineLight Blue
MayEmeraldBright Green
AugustPeridotPale Green
SeptemberSapphireDeep Blue
Aquarius21 Jan to 19 FebMalachite/Azurite
Pisces20 Feb to 20 MarEmerald or Amethyst
Aries21 Mar to 20 AprRuby
Taurus21 Apr to 21 MaySapphire
Gemini22 May to 21 JuneAquamarine
Cancer22 Jun to 23 JulMoonstone or Pearl
Leo24 Jul to 23 AugTopaz or Citrine
Virgo24 Aug to 23 SepJade
Libra24 Sep to 23 OctOpal
Scorpio24 Oct to 22 NovBloodstone
Sagittarius23 Nov to 21 DecTurquoise
Capricorn22 Dec to 20 JanDiamond or Onyx

More Information

If you have any questions please don't hesitate to get in touch.