 Shape and cut |
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 History of the various shapes |
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 At the Middle Ages, they
cut only the outsides faces of a stone. They levelled the faces. This method
was very practised by the Hindus. |
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In 1919, Tolkowsky
published the ideal proportions of a diamond. This cut counted 58 facets: the
table, 32 facets between the table and the girdle and 24 facets between the
girdle and the culet. This cut is regarded as the base of the modern cut. |
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In 1925, Johnson and Roesch
published the proportions of another cut which did not have much success.
This cut was called « ideal brilliant ». |
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In 1939, Eppler invented the cut
« fine practice » which approached that of Tolkowsky. |
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In 1951, Parker invented a new cut
which had the characteristic to have a very large spread out table. |
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In 1963, discovered « Princess » cut
which comprises 74 facets. |
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In 1965, discovered « high lights »
cut which comprises 146 facets. |
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In 1966, Tillander published the
standards of the Scandinavian standart. This nomenclature is used as a basis
for the modern cut. |
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In 1970, discovered « Royal 144 » cut
which comprises 144 facets. |
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In 1978, IDC (International Diamond
Council) defines the standards which gives to diamond the most refraction. |
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| History of the brilliant cut |
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 Old cuts |
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| XVIIIe century |
XIXe century |
Beginning of XXe century |
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Recent cuts |
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| Half cuts (1930) |
Modern cut |
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| Small stones |
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| 8/8 |
16/16 or swiss-cut |
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| Brilliant and fancy cut |
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| Oval |
Pear or Pearshape |
Marquise |
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| Heart |
Royal cut |
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| Step cut |
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| Emerald |
Baguette |
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| Rose cuts |
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| Cross Rose (Dutch) |
Simple Rose |
Antwerp Rose |
Shield |
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| The principal shapes of diamond |
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| Brilliant |
Oval |
Radiant |
Marquise |
Heart |
Emerald |
Pear |
Princess |
Triangle |
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| The number of facets of the principal shapes |
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| CUT NAME |
CROWN |
GIRDLE |
PAVILION |
TOTAL |
| Brilliant |
1 table, 8 bezels, 8 stars et 16 upper girdle. |
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8 pavilions et 16 lower girdle |
57 facets |
| Emerald |
25 facets. |
8 facets |
24 facets. |
57 facets |
| Marquise |
33 facets. |
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22 facets. |
55 facets |
| Oval |
33 facets. |
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22 facets. |
55 facets. |
| Pear |
33 facets. |
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23 facets. |
56 facets. |
| Radiant |
25 facets. |
8 facets. |
37 facets. |
70 facets. |
| Triangle |
7 facets. |
3 facets. |
9 facets. |
19 facets. |
| Baguette |
9 facets. |
4 facets. |
12 facets. |
25 facets. |
| 16/16 |
1 table, 16 facets. |
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16 facets. |
33 facets. |
| 8/8 |
1 table, 8 facets. |
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8 facets. |
17 facets. |
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