1.The Round Brilliant Cut Diamond
The round brilliant cut diamond is by far the most popular and most researched diamond shape available today.
For almost 100 years, diamond cutters have been using advanced theories of light behavior and precise mathematical calculations to optimize the fire and the brilliance in a round diamond.
In addition to being the most popular and researched shape, a round diamond gives you more flexibility in terms of balancing cut, colour and clarity grades while still getting the fire and brilliance you want.
To maximize the brilliance of a traditional round diamond, select one in the two highest cut grades, like the symmetry which graduation has to be from Good to Excellent and the proportions and polish which graduations have to be also from Good to Excellent.
- Diameter: The width of the diamond as measured through the girdle
- Table: This is the large, flat top facet of a diamond.
- Crown: The narrow rim of a diamond that separates the crown from the pavilion. It s the largest diameter to any part of the stone.
- Pavilion: The lower portion of the diamond, below the girdle. It is sometimes referred to as the base.
- Culet: The tiny facet on the pointed bottom of the pavilion, which is the portion of a cut gem below the girdle
- Depth: The height of a gemstone, from the culet to the table.
2. The other shapes of the diamond
The Pear Diamond Shape
This brilliant-cut diamond is also called a teardrop for its single point and rounded end.
If you choose an elongated pear shape, the length of the diamond creates a subtle slimming effect on the fingers. For the most traditional pear-shaped diamond, look for a length-to-width ratio between 1.45 and 1.75.
The Marquise Diamond Shape
The shape of a marquise diamond can maximize the carat weight, giving you a much larger-looking diamond.
For the most traditional marquise-cut diamonds, look for a length-to-width ratio between 1.75 and 2.25.
The Heart Diamond Shape
The heart is the ultimate symbol of love.
Hard to find due to low demand, but some people prefer a Heart shape diamond for sentimental purposes. For a more traditional heart-shaped diamond, look for length-to-width ratio between 0.90 and 1.10.
The Oval Diamond Shape
Not popular for solitaires, but very popular for three stone anniversary rings, with two matching diamonds on the sides.
For the most traditional oval diamonds, look for a length-to-width ratio between 1.33 and 1.66. .
The Emerald Cut Diamond Shape
A more traditional shape, the Emerald is not as popular as it once was, but still retains its old world elegance.
For the classic emerald-cut shape, look for a length-to-width ratio between 1.30 and 1.40.
The Princess Cut Diamond Shape
A square cut diamond that has refractive properties almost near the ones of a round brilliant.
The princess is the preferred square cut shape over Radiant and Asscher. For a princess diamond shape that is square, look for a length-to-width ratio between 1.0 and 1.05.
The Cushion Cut Diamond Shape
Cushion-cut diamonds have rounded corners and larger facets to increase their brilliance. These larger facets highlight the diamond's clarity, so if you choose an SI clarity grade, be sure to review the clarity plot on the diamond certificate.
For a cushion-cut diamond that is square, look for length-to-width ratio between 1.0 and 1.05. If you prefer a more rectangular shape look for a length-to-width ratio higher than 1.15.
The Radiant Cut Diamond Shape
This unique shape has been popular for more than a century.
The Radiant Cut Diamond has more facets than a Princess, but has the corners trimmed like the Emerald shape. This shape is not widely popular.
For a radiant diamond shape that is square, look for length-to-width ratio between 1.0 and 1.05. If you prefer a more rectangular shape, look for length-to-width ratio higher than 1.10.