Diamonds

Diamonds symbolise our deepest love and honour our most lasting commitments. The hardest gemstones known to us, diamonds are cut to lure light into the gem. Each polished facet acts like a tiny mirror, catching light and reflecting it out as sparkling brilliance. Diamonds can be cut into many shapes such as the well-known round, pear or marquise, as well as newer cuts, such as the flower.

Each diamond has a character of its own, and now, Western Australia produces some of the world’s most unique pink diamonds.

A diamond’s value is determined by its carat weight, clarity, colour and cut.

Independent Evaluation

Available at wholesale prices, ABC diamonds are of the finest quality. To make sure your diamond is the perfect one for you, we’ll show you a selection of loose stones before you choose your ring setting. This way you can examine it closely and once chosen, it’s sent to an independent value before being set. You’ll have a fitting before our master jewellers craft your ring and once it’s finished, we send it back to the independent valuer for a final valuation.

Diamond — the 4 C's

A diamond's value is determined in terms of the 4 C's — Carat Weight, Clarity, Colour and Cut.

1. Carat Weight

Diamond Weight Estimator (Brilliant Full cuts)

Average
Diameter
(mm)

1.3
1.7
2.0
2.4
2.8
3.0
3.4
3.8
4.1
4.4
4.8
5.2
6.5

Approx
Weight
(ct)

.01
.02
.03
.05
.08
.10
.15
.20
.25
.30
.40
.50
1.00

Approximate Formulae
for Calculating Weight

Round Brilliant Cut
Carat Weight = Height x Diameter x .0061

Oval
Carat Weight = Height x Diameter x .0062

Emerald Cut/Marquise/Pear Shape
Carat Weight = Height x Width x Depth x Adjustment Factor
(depending on length to width ration)
(approximate sizes only)

Carats
(cts)
.005
.01
.01 1/2
.02
.02 1.2
.03
.03 1/2
.04
.05
.06
.07
.08
.09
.10
.11
.12
.14
.15
.16
.17
.18

Diameter
(mm)
.1.0
1.4
1.5
1.7
1.8
2.0
2.1
2.2
2.4
2.5
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.6
3.6
3.7

Carats
(cts)
.20
.22
.23
.24
.30
.33
.39
.40
.47
.50
.60
.65
.75
.80
.85
.95
1.00
1.10
1.17
1.25
1.33

Diameter
(mm)
3.8
3.9
4.0
4.1
4.2
4.4
4.6
4.8
5.0
5.2
5.4
5.6
5.8
6.0
6.2
6.4
6.5
6.6
6.8
7.0
7.2

Carats
(cts)
1.50
1.60
1.75
1.90
2.00
2.15
2.25
2.50
2.65
2.85
3.00
3.15
3.35
3.50
3.75
4.00
4.25
4.45
4.75
5.00

Diameter
(mm)
7.4
7.6
7.8
8.0
8.2
8.4
8.6
8.8
9.0
9.2
9.4
9.6
9.8
10.0
10.2
10.4
10.6
10.8
11.0
11.2

2. Clarity

Clarity refers to the purity of the diamond

IF

VVS, VVS1, VVS2

VS, VS1, VS2
SI, SI1, SI2

P1

P2

P3

Loupe clean can only be designated if the diamond is completely transparent and free from inclusions under 10x loupe.
Very, very small inclusion/inclusions that are extremely difficult to see under 10x loupe.
Very small inclusion/inclusions that are difficult to see under 10x loupe.
Small inclusions that are easily seen under 10x loupe, however not seen by the naked eye.
Inclusions that can be seen easily under 10x loupe and just visible to the naked eye through the crown.
Large inclusions that can easily be seen with the naked eye through the crown and influence the brilliance.
Large inclusions that can easily be seen with the naked eye through the crown and dull the brilliance.