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Diamonds by Design At Diamonds by Design we custom design and create fine jewellery just for you from diamonds, opals, gems and pearls ethically sourced from conflict-free zones. For 28 years our bespoke jewellery, diamond engagement rings has delighted Sydney's discerning buyers.
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Flawless perfection...

Diamond cut is perhaps the most important of the four Cs. It is the cut of a diamond above all other properties that will determine the stone’s fire and the brilliance that seems to come from the very heart of the gem. Through a stone’s facets, the diamond cutter enhances the diamond’s natural ability to reflect and refract light.

When light enters a well-cut diamond, it is reflected from one facet to another and then dispersed through the top of the stone. Each facet acts as a light-dispersing mirror and it is this light that, when reflected, gives the diamond its sparkle.

If the cut of the diamond is too deep, some light escapes through the opposite sides of the pavilion and the stone will be less radiant.

Likewise, if the cut is too shallow, some light will escape through the pavilion before it can be reflected.

Ideal Cut
Fine Cut
Deep Cut
Shallow Cut

Stunning Diamond Shapes
Be careful not to confuse cut with shape. Shape is the silhouette of the diamond when looking from above and, due to new cutting techniques, there are several shapes that take the world’s most treasured gem beyond the traditional, round brilliant cut.

Each sensational shape has it’s own way of displaying the radiant brilliance that is unique to diamonds.

Traditionally, diamonds have been available in the eight shapes shown below: Round Brilliant, Princess, Oval, Emerald, Marquise, Pear, Heart and Trilliant.

Round: A brilliant cut diamond is the most usual of the diamond shapes. Its popularity is due to its incredible sparkle and beauty, and round diamonds look stunning no matter what the setting of the ring or shape of the wearer’s hand.
Princess: These diamonds are square in shape and have a bold modern look. With its geometric, clean lines, this cut is increasingly sought-after.
Oval: An even, perfectly symmetrical design, flattering to small hands or short fingers as its elongated shape lengthens the hand.
Emerald: This is a rectangular shape with cut corners. It is also known as step cut because the concentric broad, flat planes resemble a stairway. Since inclusions and inferior colour show up more in this particular cut, you need a stone of superior clarity and colour.
Marquise: An elongated shape with pointed ends, inspired by the smile of the Marquise de Pompadour and commissioned by the Sun King, France’s Louis XIV, who wanted a diamond to match. Gorgeous when used as a solitaire or enhanced by smaller diamonds.
Pear: A hybrid cut, combining the best of the oval and the marquise, it looks like a sparkling teardrop. The shape complements a small hand, and it is particularly beautiful in pendants or earrings.
Heart: This ultimate symbol of romance is essentially a pear-shaped diamond with a cleft at the top. The skill of the cutter determines the beauty of the stone. Look for a stone with an even shape and a well-defined outline.
Trilliant: This is a spectacular wedge of brittle fire. First developed in Amsterdam, the exact shape varies depending on the diamond’s natural characteristics and the cutter’s personal preferences. It may be a traditional triangular shape with pointed corners or a more rounded triangular shape with 25 facets on the crown, 19 facets on the pavilion, and a polished girdle. It is definitely for the adventurous.