While the diamond facets count is standard and universally agreed, the actual proportions (crown height and angle, pavilion depth, pavilion angle, and table size) have different versions.
Over the period of different types of round brilliant cuts have evolved. The modern "Round Brilliant Cut" was developed by diamond-cutter Marcel Tolkowsky in 1919.
What is Brilliant Cut diamond?
Well, according to GIA guidelines, diamonds cuts are classified under 3 basic categories, i.e. - brilliant cut, step cut and mixed cut. In a brilliant cut diamond, facets are arranged in such a manner that they appear radiating outward.
Due to this facet arrangement, brilliant cut stones have more sparkle compared to step and mixed cuts. Further, round is the most common shape where brilliant cut style is incorporated. This article is about facets arrangement of modern round brilliant cut which is the most common and popular diamond cut.
Round Brilliant Cut Diamond
How many facets does a diamond have?
"Facet" is the term used for a flat part (surface between edges) of a cut and polished diamond. The modern round brilliant - popularly known as the "Tolkowsky Cut" or "Tolkowsky Brilliant" - consists of 58 facets (or 57 if the culet is excluded), 33 on the crown (the top half above the middle or girdle of the stone), and 25 on the pavilion (the lower half below the girdle).
The girdle may be polished smooth, or faceted. In recent times girdles are generally faceted; many have 32, 64, 80, or 96 facets. These facets are however excluded from the total facet count.
You may find small extra diamond facets on the crown or pavilion, which are created to remove inclusions during the diamond cutting process. These extra facets may affect the overall facets symmetry of the stone and is taken into consideration while cut grading.
Facets should be aligned in such a manner that they enhance the reflection of light through diamond. The symmetry, depth and size of facets affect the brilliance and sparkle of diamond. Facets also affect the lifespan of diamond.
Facets of a Diamond
As listed below, diamond facets are generally named according to their location on different parts of the stone.
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