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Member of
The National Association
of Goldsmiths
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Incorporating with the T.H.J. Group Over 50 shops throughout the United Kingdom.
T.H.J. Chairman Harvey D. Morgan, B.S DIP(Dist)
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Minimum Guarantee of 3 years with Handmade Jewellery Guaranteed for 20 years.
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Founder and Managing Director Harvey D. Morgan, B.S DIP(Dist)
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Specialising in the design and creation of bespoke gold and diamond Jewellery. Agents for Raymond Weil, Rotary, Accurist, Citizen Eco Drive, Avia Watches.
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The Four Cs - Diamond Cut, Colour, Clarity & Carat Weight
Four factors that are considered when judging a diamond's quality and cost are: the diamond's colour, its clarity, diamond cut, and carat weight. These four elements are known as the Four C's. This library teaches you what you need to know about the Four C's.
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Diamonds Characteristics: Cut
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The cut of a diamond is not its shape, which may be round, rectangular, marquise, drop or even heart shape. When we talk about cut, we mean how close the master cutter has come to ideal proportions. The mathematical relationships of Facets that unlocks the hidden fire.
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How a Diamond handles light
The cut enables a diamond to make the best use of light. When a diamond is cut to good proportions, light is reflected from one facet to another and dispersed through the top of the stone. If the cut of the diamond is too deep, some light escapes through the opposite side of the pavilion. If the cut is too shallow, light escapes through the pavilion before it can be reflected.
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Diamonds Characteristics:Colour
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The best colour is no colour at all.The grading for a stone without any colour, is grade D on the GIA scale, or "Exceptional White+" on the CIBJO scale. Such a stone is extremely rare. It will be very difficult for the unskilled eye to detect any colour difference in the top five grades, and if the stone is viewed through the table (i.e through the top of the stone) in a mounted ring, it will be impossible even for experts to differentiate between these grades without a master set for comparison. The closer a diamond is to being absolutely colourless, the more valuable it will be.
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Colour
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GIA Scale
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Description
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AGS
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CIBJO
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D
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Colourless
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0
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Exceptional White +
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E
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1
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Exceptional White
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F
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2
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Rare White +
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G
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Near Colourless
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3
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Rare White
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H
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4
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White
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I
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5
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Slightly Tinted White
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J
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K
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Faint Colour
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6
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Tinted White
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L
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M
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7
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Tinted Colour
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N
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Very Light Yellow
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O
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8
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P
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Q
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R
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9
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S
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Light Yellow
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T
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U
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V
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10
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W
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X
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Y
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Z
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Diamonds Characteristics: Clarity
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A diamond, more than any other gemstone, has the capability to produce the maximum amount of brilliance. The highest quality of diamond is virtually free of interior inclusions and external features of crystallisation, is one of the highest quality, for nothing else interferes with the passage of light through the diamond. To determine a diamond's clarity, it is viewed under 10 x magnification by a trained eye. Minute inclusions neither mar its beauty nor endanger its durability, but of course the fewer they have, the rarer the stone.
Only a very small percentage of diamonds sold are in the grades of VS1 and above. The vast majority are within grades SI1-P3
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Code
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Meaning
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Inclusion Visability
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IF
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Internally flawless
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1F
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Flawless, minor surface blemishes
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VVS1
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Very, very small inclusions
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Inclusions only visible when magnified ten times
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VVS2
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VS1
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Very small inclusions
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VS2
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SI1
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SI2
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Small Inclusions
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P1
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Inclusions visible to the naked eye
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P2
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P3
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Inclusions visible to the naked eye
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Diamonds Characteristics: Carats
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Carats are the traditional way of measuring the weight of a diamond, 5 carats is equivalent to 1 gram. A carat is divided into 100 points, i.e. a diamond weighing 1.25 carats = 125 points. The following table gives an approximate guide to the diameter of a round cut diamond based on it's weight.
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Diamond
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Weight (Carats)
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Diameter (Millimetres)
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0.01
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1.3
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0.02
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1.7
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0.03
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2.0
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0.04
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2.3
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0.05
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2.4
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0.10
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3.0
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0.15
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3.4
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0.20
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3.8
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0.25
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4.2
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0.30
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4.4
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0.33
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4.5
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0.35
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4.6
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0.40
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4.8
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0.45
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5.0
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0.50
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5.2
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0.55
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5.4
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0.60
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5.5
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0.65
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5.7
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0.70
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5.8
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0.75
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5.9
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0.80
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6.1
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0.90
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6.3
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1.00
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6.5
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1.25
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7.0
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1.50
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7.5
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1.75
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7.9
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2.00
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8.2
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2.50
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8.9
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3.00
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9.4
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