Celsteel Diamond


The Diamond Wholesaler You Can Trust

We have an extremely large stock of diamonds in all shapes and sizes.

Our stock starts with small goods of 600 per carat (0.7mm) going up to fine individual GIA certified stones.


For our stock of Brilliants we try and keep the colour to a standard F/G plus consistently throughout the grades as we feel that this is a big factor in our success, as our customers can be sure that each time they order the colour will be exactly the same as the time before, so giving them consistency with their clients. The purity will of course vary with the type of goods you require.

Interesting Diamond facts

We start with 600 per carat (0.7mm) going up through the sizes as follows:

Round Brilliant Cuts

Sieve Size
Approximate Carat Weight
Approximate MM size
-0+0+1.5 -2+2 -2.5+2.5 -3+3.5 -4+4.5 -5+5.5 -6+3.5 -4+4.5 -5+5.5 -6+6 -6.5+6.5 -7+7 -7.5+7.5 -8 +8 -8.5+8.5 -9+9 -9.5+9.5 -10+10 -10.5+10.5 -11 +11 -11.5 +11.5 -12+12 -12.5+12.5 -13+13 -13.5+13.5 -14+14 -14.5 +14.5 -15+15 -15.5 – –
0.0050.0070.0080.0090.010.0120.0150.0180.0220.0250.0030.0350.0040.0450.0500.0600.065 0.050 0.060 0.065 0.07 0.08 0.09 0.10 0.14 0.15 0.16 0.20 0.25 1.70 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 3.804.00

Princess Cuts

Approximate Carat Weight
Approximate MM size
0.0140.0180.0200.0250.0300.0350.0400.0450.050.06 0.07 0.08 0.09 0.10 0.16 0.20 0.25
1.201.301.401.501.601.701.801.90 2.00 2.10 2.20 2.30 2.40 2.50 3.00 3.20 3.50


We have a range of fancy colours from Browns to Vivid Yellows, please call for our latest list.

Fancy Shapes

We have a large stock of fancies in Emerald Cuts, Ovals, Princess cuts, Baguettes, Marquise and Pears Shapes, and we also keep a smaller stock of Squares and Trillions. We also have pairs of half moons, trapeziums, tapers etc for side stones.

In fancy cut diamonds

We generally only keep the higher colours and top makes as we have found that these are by far the most popular goods for our customers to stock. We are extremely careful with the makes in the fancies as many of our customers want to mix different sizes of the same shape together in the same piece and they must therefore have consistency. For example if you wanted to put a 4Opt Emerald cut together with a pair of 20pts, it would be no problem as the makes are the same, and would match perfectly.

In fancies we generally keep the following sizes
10pts to 13pts
15pts to 17pts
18pts to 22pts
23pts to 27pts
28pts to 37pts
38pts to 44pts
45pts to 69pts
70pts to 89pts
90pts to 99pts



We keep a large stock of certified stones, in all shapes and sizes. The demand for certified diamonds has increased dramatically over the last few years, with the result that virtually all fine quality diamonds now come with a certificate.

Contact us today for further information