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At Sirius Jewels, we are committed to crafting the most expertly proportioned diamonds and this precision is what sets our diamonds apart.
More than any other factor, cut determines the brilliance, fire and overall beauty of your diamond. If a diamond is cut poorly, it will appear dull even if it has a high colour and clarity grade. It takes a skilled and experienced diamond cutter to sculpt a perfectly proportioned diamond.
A well-cut diamond will have carefully crafted and positioned facets in areas known as the crown, girdle, and pavilion. The facets are polished to sizes and angles with mathematical precision, to maximise the diamond’s ability to reflect and return light to the viewer. This is described as a diamond’s ‘life’.
A diamond’s cut grade is evaluated within a range:
Excellent: Well proportioned, distributing light evenly through the diamond, this is the highest cut grade
Very Good: A majority of the light is still reflected through the crown, or the top, of the diamond
Good: A diamond with a Good cut will still reflect a good deal of light, but will not appear as brilliant as a higher cut grade
Fair: Fair-cut diamonds will not display the correct proportions, which will cause a loss of light at the bottom of the diamond, appearing darker than higher cut grades
Poor: Poor cut diamonds are the lowest cut grade, and often appear dull and lifeless
Every diamond has followed an epic journey over billions of years, a result of searing temperatures and extreme pressures deep in the Earth, brought to the surface through volcanic eruptions. This natural process has resulted in almost all diamonds developing small natural features, called inclusions, along their journey.
Though usually invisible to the naked eye, inclusions influence the value of a diamond through the clarity grade. The closer a diamond is to being pure, the more rare it is and the higher the grade, therefore the greater the value.
Diamond clarity is graded within a range from Flawless to Included:
Flawless (FL): Flawless diamonds don’t have any internal features or blemishes visible when magnified up to 10 times
Very Very Slight (VVS): These diamonds feature small inclusions that are difficult to locate, even by diamond experts
Very Slight (VS): Diamonds with VS clarity feature more inclusions, and are divided into VS2 and VS1 categories, with VS1 diamonds have fewer inclusions than VS2 diamonds
Slightly Included (SI): Categorised as SI1 and SI2, slightly included diamonds will show more apparent inclusion features under 10 times magnification
Included (I): Categorised as I1, I2 and I3, Included diamonds will have features visible to the unaided eye
Carat is often mistaken for being a measure of size, but it is a measure of weight. Because diamonds become more and more rare the greater the carat weight.
One carat is equal to .2 grams and is then divided into 100 points. This means that a half-carat, or .50 carat diamond is also known as a 50 points diamond.
A diamond’s colour is valued by its absence – like a drop of pure water, a perfectly structured diamond is completely clear. But because colourless diamonds naturally develop in slightly different shades, we use a grading scale from D to Z to show whether a diamond is truly colourless (D) or off-white (Z). The differences between one colour grade and the next are very subtle, so grading is done under controlled lighting and in precise conditions, using a master diamond sample set for comparison and accuracy.
Natural diamonds also occur in shades of blue, green, yellow-orange, pink, red and even black. Known as ‘fancy colour diamonds’, these are extremely rare and valuable. They are graded according to their strength of colour, with more colour holding greater value.
Diamond colour is categorised in the following colour grades:
D, E and F: Colourless
G, H and I: Near Colourless
J, K and L: Slightly Tinted
M – R: Very Light Yellow
S – Y/Z: Light Yellow
