Jewelry – Gem
Reexamination Certificate
2000-10-17
2001-10-23
Dayoan, B. (Department: 3628)
Jewelry
Gem
CD11S089000, CD11S090000
Reexamination Certificate
active
06305193
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a gemstone which has a particular number of facets on the facet portion thereof. In particular, the gemstone may include certain facets that may enhance the brilliance of the gemstone.
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 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 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
.
Using this configuration of the facets of the crown
20
, is was possible to obtain a brilliance effect with the conventional gemstone
10
which was generally acceptable to a consumer.
SUMMARY OF THE PRESENT INVENTION
The object of the present invention is to provide a better effect on a scintillation, i.e., a sparkle of the gemstone when its is irradiated in light and moved, which is caused by a light reflection of the light within the gemstone.
Thus, a gemstone according to an exemplary embodiment of the present invention is provided to achieve this object. The gemstone includes a pavilion portion, a crown portion and a girdle portion provided between the pavilion portion and the crown portion. The crown portion includes a plurality of facets provided on a surface thereof. The crown portion can have eight longitudinal sections which collectively define it. At least one of the longitudinal sections includes a predetermined number of particular facets. Each of the particular facets has at least one edge that borders the girdle portion. A single facet of the particular facets is formed from cutting at least portions of at least two further facets of the particular facets
In another embodiment of the present invention, each one of the predetermined facets includes at least one further edge that borders another one of the predetermined facets within a particular longitudinal section of the crown portion. Each of the longitudinal sections may include the predetermined number of the particular facets. All of the longitudinal sections may also have substantially the same dimensions.
In a further embodiment of the present invention, first four consecutive longitudinal sections can define a first half of the crown portion, and second four consecutive longitudinal sections can define a second half of the crown portion. In this embodiment according to the present invention, the first half and the second half form the crown. Additionally, all edges of the particular facets which border the girdle portion may collectively define an upper edge of the girdle portion. In addition, at least one edge of each of the particular facets which border the girdle portion may have a curved shape.
Another embodiment of the present invention provides that there are three facets arranged on the longitudinal section. Each of the first and second facets within a first section of the longitudinal sections have two first parallel edges. The third facet has edges which border particular parallel edges of the first and second facets. In addition, the girdle portion generally extends along a first plane, and at least one of the particular facets extends along a second plane. It is preferable for the first plane to be provided at a predetermined angle with respect to the second plane, such angle being between approximately 43.7° and 50.7°.
In yet another embodiment of the present invention, the gemstone can be logically subdivided into two longitudinal half sections. The crown portion of at least one the longitudinal half section has 12 facets that border the girdle portion of the longitudinal half section.
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patent: 3585764 (1971-06-01), Huisman et al.
patent: 3763665 (1973-10-01), Polakiewicz
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patent: 5761929 (1998-06-01), Freilich
patent: 6006548 (1999-12-01), Freilich
Eric Bruton F.G.A., “Some Variations of the Brilliant Cut”, DIAMONDS 2nd edition, 1981, p. 222.
Baker & Botts L.L.P.
Chop Andrea
Continental Jewelry (USA) Inc.
Dayoan B.
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