MODIFIED PRINCESS CUT DIAMOND HAVING HEARTS AND ARROWS PATTERN AND METHOD
First Claim
1. A modified princess cut diamond having a symmetrical shape possessing a hearts and arrows pattern characteristic of the true hearts and arrows pattern in a round cut diamond comprising:
- a tablet facet, 4 main crown facets, 8 crown halves, 8 crown star facets, 4 subsidiary crown facets, 8 subsidiary crown halves, 8 main pavilion facets, 4 subsidiary pavilion facets, 16 pavilion facet halves and a girdle with each main crown facet having a pair of crown star facets symmetrically disposed on one side thereof adjacent to the table facet, and a pair of main crown halves symmetrically disposed on the opposite side thereof, with each pair of crown star facets having a side thereof adjoining the table facet meeting at a point equal to essentially half the longer distance of the main crown facet measured horizontally, and with all crown star facets having identical polished angles and with the subsidiary crown halves adjacent each main crown facet having identical polished angles measured from the surface of the table facet to a maximum tolerance of 0.3°
, with each of the crown halves polished into alignment with each other and into alignment with the pavilion facet halves, and that the subsidiary crown halves are aligned in common at each end of the diamond to form a cut corner in the diamond at each such end thereof, with each of the subsidiary crown halves at each end of the diamond;
having a polished angle smaller than the main crown halves for forming an included angle of 45°
with an abutting one of the adjacent main crown halves, and wherein the angle of the pavilion halves is steeper than the main pavilion angle.
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Accused Products
Abstract
A modified princess cut diamond and method of forming a modified princess cut diamond into a symmetrical shape possessing a hearts and arrows pattern characteristic of the true hearts and arrows pattern in a round cut diamond. The modified princess cut diamond includes: a tablet facet, 4 main crown facets, 8 crown halves, 8 crown star facets, 4 subsidiary crown facets, 8 subsidiary crown halves, 8 main pavilion facets, 4, subsidiary pavilion facets, 16 pavilion halves and a girdle with each main crown facet having a pair of crown star facets symmetrically disposed on one side thereof adjacent to the tablet facet and a pair of crown halves symmetrically disposed on the opposite sides thereof with each pair of crown star facets having the side thereof adjoining the table facet meeting at a point equal to essentially half the longer distance of the main crown facet measured horizontally and with all crown star facets and crown halves adjacent each main crown having identical polished angles with a maximum tolerance of 0.30.
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Citations
8 Claims
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1. A modified princess cut diamond having a symmetrical shape possessing a hearts and arrows pattern characteristic of the true hearts and arrows pattern in a round cut diamond comprising:
- a tablet facet, 4 main crown facets, 8 crown halves, 8 crown star facets, 4 subsidiary crown facets, 8 subsidiary crown halves, 8 main pavilion facets, 4 subsidiary pavilion facets, 16 pavilion facet halves and a girdle with each main crown facet having a pair of crown star facets symmetrically disposed on one side thereof adjacent to the table facet, and a pair of main crown halves symmetrically disposed on the opposite side thereof, with each pair of crown star facets having a side thereof adjoining the table facet meeting at a point equal to essentially half the longer distance of the main crown facet measured horizontally, and with all crown star facets having identical polished angles and with the subsidiary crown halves adjacent each main crown facet having identical polished angles measured from the surface of the table facet to a maximum tolerance of 0.3°
, with each of the crown halves polished into alignment with each other and into alignment with the pavilion facet halves, and that the subsidiary crown halves are aligned in common at each end of the diamond to form a cut corner in the diamond at each such end thereof, with each of the subsidiary crown halves at each end of the diamond;
having a polished angle smaller than the main crown halves for forming an included angle of 45°
with an abutting one of the adjacent main crown halves, and wherein the angle of the pavilion halves is steeper than the main pavilion angle. - View Dependent Claims (2)
- a tablet facet, 4 main crown facets, 8 crown halves, 8 crown star facets, 4 subsidiary crown facets, 8 subsidiary crown halves, 8 main pavilion facets, 4 subsidiary pavilion facets, 16 pavilion facet halves and a girdle with each main crown facet having a pair of crown star facets symmetrically disposed on one side thereof adjacent to the table facet, and a pair of main crown halves symmetrically disposed on the opposite side thereof, with each pair of crown star facets having a side thereof adjoining the table facet meeting at a point equal to essentially half the longer distance of the main crown facet measured horizontally, and with all crown star facets having identical polished angles and with the subsidiary crown halves adjacent each main crown facet having identical polished angles measured from the surface of the table facet to a maximum tolerance of 0.3°
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3. A princess cut diamond as defined in claim 3 wherein (1) the pavilion half angles are 1.2°
- larger than the main pavilion angles;
(2) the crown halves are 3.8°
larger than the main crown angles; and
(3) the crown star angles are 4°
-5°
flatter than the main crown angles.
- larger than the main pavilion angles;
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4. A method for polishing a diamond to form a modified princess cut diamond which will display a hearts and arrows pattern comprising:
- a tablet facet, 4 main crown facets, 8 crown halves, 8 crown star facets, 4 subsidiary crown facets, 8 subsidiary crown halves, 8 main pavilion facets, 4 subsidiary pavilion facets, 16 pavilion halves, and a girdle with each main crown facet having a pair of crown star facets symmetrically disposed on one side thereof adjacent to the table facet, and a pair of main crown halves symmetrically disposed on the opposite side thereof, wherein the princess cut possesses a hearts and arrows pattern characteristic of the true hearts and arrows pattern in a round cut diamond, said method comprising the steps of;
polishing the subsidiary crown facets to be smaller in length than the length of the crown halves, polishing the subsidiary crown halves to lie at exactly a 45°
angle relative to the adjacent crown half, polishing each of the crown halves into alignment with each other and into alignment with the pavilion half facets, and with the crown halves forming an included angle α
which is larger than the adjacent included angle β
formed by the subsidiary crown facets on the cut corner sides of the diamond, so as to allow-the crown halves to be of equal size and the subsidiary crown halves to be of equal size, and wherein the angle of the pavilion halves is steeper than the main pavilion angle, the crown halves are at an angle steeper than the angle of the main crown angles and the total depth of the princess cut is between 68%-71% wherein total depth in %=height/width×
100. - View Dependent Claims (5, 6, 7, 8)
- a tablet facet, 4 main crown facets, 8 crown halves, 8 crown star facets, 4 subsidiary crown facets, 8 subsidiary crown halves, 8 main pavilion facets, 4 subsidiary pavilion facets, 16 pavilion halves, and a girdle with each main crown facet having a pair of crown star facets symmetrically disposed on one side thereof adjacent to the table facet, and a pair of main crown halves symmetrically disposed on the opposite side thereof, wherein the princess cut possesses a hearts and arrows pattern characteristic of the true hearts and arrows pattern in a round cut diamond, said method comprising the steps of;
Specification