Oval shaped diamond cut having hearts and arrows pattern
An oval shaped diamond, adapted to display a hearts and arrows pattern when exposed to light characteristic of the hearts and arrows pattern in a round diamond, comprising: an oval shape having two long sides symmetrical to each other, two short sides symmetrical to each other and four corner sides symmetrically located between the long sides and the short sides respectively, eight main crown facets of unequal size and eight main pavilion facets of unequal size, sixteen pavilion half facets; a girdle of non-uniform thickness separating the crown and pavilion facets and two subsidiary pavilion facets in alignment with each other on the long sides of the diamond adjacent a main pavilion facet.
1. An oval shaped diamond, adapted to display a hearts and arrows pattern when exposed to light characteristic of the hearts and arrows pattern in a round diamond, having an oval shape including two long sides symmetrical to each other, two short sides symmetrical to each other and four corner sides symmetrically located between the long sides and the short sides respectively, and comprising eight main crown facets of unequal size surrounding a flat table and eight main pavilion facets of unequal size, sixteen pavilion half facets; a girdle of non-uniform thickness separating the crown and pavilion facets and two subsidiary pavilion facets in alignment with each other on the long sides of the diamond adjacent a main pavilion facet wherein the eight main crown facets include two crown facets on the long side each having one edge in horizontal alignment with the long side when the long side is oriented in a horizontal direction and being aligned in parallel with one another, two crown facets on the short side having one edge in vertical alignment with the short side when the short side is oriented in a vertical direction and being aligned in parallel with one another and with the crown facets on the corner sides disposed opposite to one another with each having one side extending in a straight line between a crown facet on the long side and a crown facet on the short side and having a parallel relationship with one another.
2. An oval shaped diamond as defined in claim 1 wherein each pavilion half facet is polished substantially at the same angle degree within a range of between 42.0° and 42.6° relative to a horizontal plane through the diamond when the flat table of the diamond is aligned with the horizontal.
3. An oval shaped diamond as defined in claim 2 wherein the pavilion half facets on the corner sides are longer than the pavilion half facets on the long sides but shorter than the pavilion half facets on the short sides.
4. An oval shaped diamond as defined in claim 3 wherein the girdle is thicker on the long side of the diamond compared to the girdle thickness on the corner sides or the girdle thickness on the short sides.
5. An oval shaped diamond as defined in claim 2 wherein the eight main pavilion facets are polished relative to the pavilion side of the diamond within the range of 40.5° and 41.1° and the main crown facets polished within the range of 33.8° and 35.2° relative to the flat table.
6. An oval shaped diamond as defined in claim 2 further comprising sixteen crown half facets and eight crown star facets.
7. An oval shaped diamond as defined in claim 6 wherein the main pavilion facets and the pavilion half facets are in alignment with the eight main crown facets and are polished at 45° from each other.
8. An oval shaped diamond as defined in claim 7 wherein the subsidiary pavilion facets are polished at angle degrees of between 65° to 73° relative to a horizontal plane through the diamond when the flat table of the diamond is aligned with the horizontal.