Summary: Modified Brilliant Cut Diamond
The modified brilliant cut is a classification for diamond shapes that include fancy shapes such as the oval, pear, marquise, heart and trillian.
The brilliant cut actually includes the round brilliant within its parameters. While the round brilliant is not considered a Fancy cut, there are quite a few Fancy shapes that are the result of the brilliant cut, and these are put under the sub category of 'modified brilliant'. Essentially, diamond shapes that result from the brilliant cut are variations on the round brilliant. The brilliant cut is marked by the 58-facet form. As the name implies, this cut creates diamond shapes that are faceted for maximum brilliance and fire.
It is important to be aware that the modern brilliant cut was developed in early to mid 20th century. It has variations in bezel facet length (which are longer in the early modern brilliant cut than the later modern brilliant cut) and position of the pavilion main facets (extending longer in the later modern brilliants than in the early modern brilliants). The diamond shapes that fall into this category include: Oval, Pear, Marquise, Heart, Trillian and various oddly shaped side- stones (such as the kite and moon shaped side-stone diamonds).