Gemstone

Details Gemstone Gemstone

2001-02-12

2002-06-11

Lavinder, Jack (Department: 3628)

Jewelry

Gem

CD11S089000, CD11S090000

Reexamination Certificate

active

06401489

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a gemstone which has a particular shape, and which has a particular number of facets on the crown, girdle, and pavilion portion thereof. In particular, the gemstone may have a shape of a sunflower or other similar shape.
BACKGROUND INFORMATION
Generally, facets on precious and semi-precious gemstones are cut so as to provide a brilliance to these gemstones in an economical manner. The way to cut the gemstones to provide particular facets thereon and the locations of these facets on the gemstones are well known in the art.
FIGS. 1-4
show an exemplary illustration of a conventional gemstone
10
having a circular shape as viewed from top view (FIG.
4
). However, it is possible that another embodiment of the gemstone
10
may have other shapes (e.g. an oval shape, a marquis shape, etc.). The conventional gemstone
10
has a prior art configuration of facets on the surface of the gemstone
10
. In particular,
FIG. 1
shows a side view of the conventional round-shaped gemstone
10
. The conventional gemstone
10
includes a crown
20
and a pavilion
30
. The crown
20
is provided above the pavilion
30
, and is separated from the pavilion
30
by a girdle
40
. The crown
20
and the pavilion
30
have particular facets provided thereon. As known to those having ordinary skill in the art, these facets are arranged to enhance the brilliance of the gemstone
10
.
FIG. 2
shows separate portions of the conventional gemstone
10
, i.e., the crown
20
, the pavilion and an enlarged illustration of the crown
40
.
FIG. 3
shows an enlarged side view and
FIG. 4
shows an enlarged top view of the crown
20
of the conventional gemstone
10
. The crown
20
includes a flat table
50
which has a shape of an octagon and is disposed primarily in the horizontal plane on top of the crown
20
. In addition, facets are provided on a diagonally extending side
25
of the crown
20
. These facets include star facets
110
(each having a shape of a triangle), upper main facets
120
(each having four sides), left-side upper girdle facets
130
(each having a pointed end directed to the left side), and right-side upper girdle facets
140
(each having a pointed end directed to the right side). The crown generally has eight star facets
110
, eight upper main facets
120
, eight left-side upper girdle facets
130
and eight right-side upper girdle facets
140
. Accordingly, the crown
20
has a total of thirty-two (32) facets and the table
50
(which can be considered as another facet) provided thereon.
The longest edges
115
of the star facets
110
form edges
55
of the table
50
. A right edge
118
of each star facet
110
forms a shorter left edge
126
of a respective upper main facet
120
. A left edge
117
of each star facet
110
forms a shorter right edge
128
of another upper main facet
120
. A right edge
137
of each left-side upper girdle facet
130
forms a longer left edge
124
of a respective upper main facet
120
, while a left edge
135
of the same left-side upper girdle facet
130
forms a longer right edge
122
of another upper main facet
120
. Bottom edges
138
of the left-side upper girdle facets
130
and bottom edges
148
of the right-side upper girdle facets
140
collectively form an upper edge
45
of the girdle
40
.
FIG. 5
shows an enlarged side view and
FIG. 6
shows an enlarged bottom view of the pavilion
30
of the conventional gemstone
10
. The pavilion
30
includes facets on a diagonally extending side
35
of the pavilion
30
. These facets include left-side lower girdle facets
150
(each having a shape of a triangle), right-side lower girdle facets
160
(each having a shape of a triangle), and lower main facets
170
(each having four sides). The pavilion generally has eight left-side lower girdle facets
150
, eight right-side lower girdle facets
160
, and eight lower main facets
170
. Accordingly, the pavilion
30
has a total of twenty-four (24) facets provided thereon.
Each of the left edge
157
of the left-side lower girdle facets
150
form the longer right edge
175
of the lower main facet. Each of the right edge
155
of the left-side lower girdle facets
150
form the left edge
165
of the right-side lower girdle facets
160
. Each of the right edge
167
of the right-side lower girdle facet
160
form the longer left edge
176
of the lower main facet. Each of the shorter left edge
177
of the lower main facet
170
form the shorter right edge
178
of the lower main facet
170
. Top edges
158
of the left-side lower girdle facets
150
and top edges
168
of the right-side lower girdle facets
160
form a lower edge of the girdle
40
.
Using this configuration of the facets of the crown
20
, is was possible to obtain a brilliance effect and appeal with the conventional gemstone
10
which was generally acceptable to a consumer.
SUMMARY OF THE PRESENT INVENTION
An object of the present invention is to provide a brilliance effect and appeal with a gemstone for a consumer.
In order to achieve these objectives as well as others that will become apparent with reference to the following specification, the present invention provides a gemstone and a method for making the gemstone. In one arrangement, the gemstone includes a crown portion and a girdle portion abutting the crown portion and extending along a predetermined plane. The crown portion has a plurality of crown facets provided on a surface thereof. The crown portion and the girdle portion each have eight longitudinal sections. At least one of the eight longitudinal sections of the crown portion have a first facet of the crown facets having a first edge bordering the girdle portion, and a second facet of the crown facets having a second edge bordering the girdle portion. A particular portion of the first edge abuts the second edge at a particular location. The first and second edges curve toward a center of the gemstone which is provided on the particular plane. The particular location is closer to the center of the gemstone than another portion of the first edge. Preferably, a particular portion of the second edge abuts the first edge at the particular location, and the particular location is closer to the center of the gemstone than another portion of the second edge. Advantageously, a pavilion portion including a number of pavilion facets provided on the surface thereof, and the girdle portion abuts with the pavilion portion and extends along the predetermined plane.
In an especially preferred arrangement, the pavilion portion of the gemstone has eight longitudinal sections, wherein at least one of the eight longitudinal sections of the pavilion portion has a third facet of the pavilion facets having a third edge bordering the girdle portion and a fourth facet of the pavilion facets having a fourth edge bordering the girdle portion. A particular portion of the third edge abuts the fourth edge at a further location. The third and fourth edges curve toward the center of the gemstone provided on the particular plane. The further location is closer to the center of the gemstone than another portion of the third edge. Preferably, a particular portion of the fourth edge abuts the third edge at the further location, and the further location is closer to the center of the gemstone than another portion of the fourth edge.
In accordance with another preferred arrangement, a method of making the gemstone is provided. According to the method, the gemstone is provided with a crown portion and a girdle portion, the crown portion extending along a predetermined plane, a first facet of the crown portion has a first edge abutting the girdle portion of the gemstone. A second facet of the crown portion of the gemstone has a second edge abutting the girdle portion of the gemstone, wherein a particular portion of the first edge abuts the second edge at a particular location. The method executes successive cuts in the gemstone such that the first edge and the second edge curve towards a center of the gemstone wherein the center is p

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