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."

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