Heart Shaped Diamonds
This shape characteristically appears like the heart icon and has a nearly round pavilion. If a heart shaped diamond is well cut, it provides a beautiful brilliance back out of the diamond. The suggested length to width ratio is 0.9-1.2:1
A famous heart shaped diamond is “The Blue Heart” and is also one of the three well-known blue diamonds. The Blue Heart weighs 30 carats and is now property of the Smithsonian Institution in Washington D.C.
The oval is an elongated relative of the round brilliant. With a total of 55 facets, 33 on the crown and 22 on the pavilion, the advantage of this shape is that it looks larger than it is. Based on the traditional round brilliant diamond developed by Lazare Kaplan in the early 1960s, the advisable length-to-width ratio would be around 1.5:1 to create a pleasing effect when mounted.
One of the world largest oval shaped diamonds is known as the “Koh-I-Noor” or “Mountain of the light” which weighed 186 carats upon discovery. It was used in the famous peacock throne of Shah Jehan and was recut during Queen Victoria’s reign. Currently weighing 108 carats, this oval is part of the British Crown Jewels along with “The Star of Africa.”
Originally, the radiant cut diamond combined the classic elegance of the traditional emerald cut shape with the sparkle of the “brilliant” cut. Today a typical radiant cut appears like a princess, emerald and round combined.
It contains a total of 70 facets, with 25 facets on the crown, 8 facets on the girdle and 37 facets on the pavilion. The corners of a radiant are slightly cut, forming an octagonal shape.
Emerald Cut Diamond
This rectangular shape has “steps” on the sides and corners. It offers a sleek sophisticated look with fewer facets. More often than not, the gemstone emerald is cut in a rectangular or square shape with its facets polished diagonally across the corner. Generally, an emerald shaped diamond has 57 facets with 25 facets on the crown, 8 facets on the girdle and 24 facets on the pavilion.
Unlike most fancy shaped diamonds, the emerald’s pavilion exhibits a unique brilliance. This is the only shape that emphasizes the clarity of the diamond with its rectangular facets. The typical length-to-width ratio of an emerald shaped diamond is between 1.30 and 1.40.
“The Jonker” is a famous emerald shaped diamond found by Johannes Jacobus Jonker. It weighs 125.33 carats. Other famous emerald shaped diamonds are: “Table of Islam” diamond (160.18 carats) and the 115.00 carat “Edna Star” diamond.
References: Diamond clarity and guidelines – https://beyond4cs.com/clarity/
A typical Marquise (pronounced as “Mar-KEYS” ) is an oblong-shaped diamond with pointed ends, containing 55 facets, with 33 on the crown and 22 on the pavilion. It was named after the 17th century Marquis of Pompadour, a very influential patronage of literature and arts.
The legend goes that the Sun King was engrossed by the Marquise’s fetching smile and wanted a diamond to match it.
With a total of 56 facets, a pear shaped diamond is rounded on one end and pointed on the other, resembling a teardrop. Choose one where the girdle at the point isn’t too thin, otherwise the diamond will be unstable. An ideal cut for a pear shaped diamond must have good depth and nicely polished angles. Like most fancy shapes, this sparkler will look good on most hands.
The largest pear shaped diamond is known as “The Star of Africa,” fashioned from another famous diamond, The Cullinan. This 530.20 carat stone is now among the British Crown Jewels. Another famous pear shaped diamond is “The Idol’s Eye.” It weighs 70.20 carats and was once part of a devotional statue before it was stolen.