ORNAMENTS USING JEWELS

Abstract: A ring (4) is such that a pavilion or a diamond (1), which is not so high in color grade, has its end closely fitted into a recess provided in a blue based sapphire (2) and the diamond-piggybacking sapphire is secured to a ring for jewels.

Description: TECHNICAL FIELD The present invention relates to an ornament such as a ring or pendant with a gem, e.g. diamond. BACKGROUND Jewelry ornaments including rings and pendants are known as precious and valuable using diamonds and other gems. Diamond is one of the most popular gems and its quality is graded by the factors of color, clarity (or inclusions), cutting (polishing) , and weight (measured in karat). If a diamond contains a significant amount of impurities or flaws, it is graded as industrial use. The cutting is made commonly in 58-facet brilliant cut. Fig.9 illustrates a faceted diamond of which sections are denoted by numerals. Shown are a pavilion vertex 11, a crown 12, a table 13, and a pavilion 14. The pavilion 14 has a culet provided at the vertex thereof. Particularly, the color grade is best concerned as natural diamonds are rarely reclaimed in pure crystal, pink, or blue color. Such highly graded color diamonds are precious and admirable and will thus be enormously expensive. It is understood that if low graded, inexpensive diamonds having brown or yellow tint are successfully turned to pink or blue color or clear transparency, their value is increased and used as jewelry. Techniques have been introduced for turning low graded, yellowish diamonds to other favorable colors by exposing them to radioactive rays. However, radioactive-ray tinted or industrially treated diamonds are classified as non natural gems and fail to be accompanied with written certificates which are essential for marketing. It is an object of the present invention to provide a jewelry ornament of which precious stone or gem is provided with no artificial treatment. A jewelry ornament according to the preamble of claim 1 is disclosed in FR-A-960 494. DISCLOSURE OF THE INVENTION According to the present invention, there is provided a jewelry ornament comprising a transparent or semi-transparent gem and a color back-up material disposed behind the gem characterised in that the color back-up material is a single color gem, in that the transparent or semi-transparent gem is spaced by a small gap from the single color gem and in that the jewelry ornament has a support formed with a hole which is behind the single color gem. The jewelry ornament according to the invention has the color back-up material, i.e. the single color gem, disposed behind the transparent or semi-transparent gem. When the jewelry ornament is viewed from the front, it appears having a hue affected by the color of the back-up material and is corrected from its original color. As the jewelry ornament according to the invention can employ a color gem of any desired color, it provides a color combination of the two stones providing an improved appearance. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view of a jewelry ornament in the form of a ring; Fig. 2 is a side view showing a primary part of a ring; Fig. 3 is a cross sectional view of the primary part of a ring; Fig. 4 is a partially cross sectional side view showing another ring; Fig. 5 is a partially cross sectional side view showing a ring according to the present invention; Fig. 6 illustrates a primary part of a ring, Fig. 6A being a cross sectional view showing a transparent or semi-transparent material applied to about the joint between a diamond and a sapphire and Fig.6B being a cross sectional view showing a gap between the diamond and the sapphire filled with the transparent or semi-transparent material; Fig.7 is a front view of a jewelry ornament in the form of a pendant according to the present invention; Fig.8 is a side view of the pendant; and Fig.9 is a cross sectional view explaining by names sections of a faceted diamond. BEST MODE FOR EMBODYING THE PRESENT INVENTION A jewelry ornament will be described in the form of rings referring to the accompanied drawings. First Example Fig.1 is a side view of a ring. Figs.2 and 3 are a side view and a cross sectional view of a primary region of the same. Denoted by 1 in Figs.1, 2, and 3 is a low grade diamond with a brilliant cut. There is a blue sapphire 2 which has a recess 21 provided in the top center thereof. The sapphire 2 is installed by prongs to the base of a prong mount 31 of a jewelry ring 3. The diamond 1 is tightly fitted with its pavilion vertex 11 into the recess 21 of the sapphire 2. More particularly, the diamond 1 is secured over the sapphire 2 constituting two layers. The ring 4 of this example is constructed as described above. In the ring 4, the blue color of the sapphire 2 is reflected through the pavilion vertex 11 of the diamond 1 to the crown 12 and the table 13. This allows the diamond 1 on the ring 4 to be viewed in a blue color. In other words, the diamond 1 of a low color grade is observed as if it is as a high graded one as being a jewelry piece. The diamond itself is not dyed or tinted and comes with an appropriate certificate thus not affecting its market value. When a moderate graded diamond which has a certain degree of commercial value is assembled to a jewelry ornament, it appears having a favorable hue as if it is a natural, high grade diamond. Second Example Another example will be explained in the form of a ring having a diamond and a blue sapphire in a different combination. Fig.4 is a partially cross-sectional side view of a ring. The pavilion vertex 11A of a diamond 1A is joined directly to the upper surface of a sapphire 2A. Since the sapphire 2A has no recess, the ring will be fabricated with much ease as compared with the previous one shown in Figs.1, 2, and 3. The blue color of the sapphire 2A is yet reflected towards the diamond 1A which is thus observed in a blue color. When an amount of transparent or semi-transparent resin material 5A is applied close to and about the joint between the pavilion vertex 11A of the diamond 1A and the sapphire 2A, an apparent area of the joint is increased promoting the transmission of the blue color from the sapphire 2A. Embodiment Of The Present Invention An embodiment of the present invention will be described in the form of a ring in which a diamond is placed by a small distance from a blue sapphire. Fig.5 is a partially cross-sectional side view of the ring according to the invention. There is provided a clearance S between the pavilion vertex 11B of a diamond B and the upper surface of a sapphire 2B. The clearance S provides ease of the assembling work without requiring critical accuracy. If the clearance S is not made, a lower color material has to be precisely set beneath the pavilion vertex of an upper diamond. The precise setting without any marginal allowance is significantly difficult because abrupt contact of the material with the pavilion vertex may cause breakage or injury. Also, the pavilion vertex is fragile and may be fractured if stressed by an unwanted external force in common use. It is possible to fill the clearance S with a dose of transparent or semi-transparent resin material 5B which also serves as an adhesive. The resin material 5B increases the joint area between the pavilion vertex 11B of the diamond 1B and the sapphire 2B thus promoting the transmission of the blue color from the sapphire 2B to the diamond 1B. The construction of this embodiment is easier in assembling work than those shown in Figs.1, 2, 3, and 4 regardless of different sizes of the gems. The two, upper and lower, gems can be joined to each other by the resin adhesive material. When no gap of air is given between the pavilion vertex 11B of the diamond 1B and the sapphire 2B, diffusion of light at the interface will be reduced allowing the blue color of the sapphire 2A to be highly transmitted to the diamond 1B. Accordingly, the diamond 1B appears having a blue color and its quality will be similar to of a high grade color diamond. The embodiment with a combination of diamond and blue sapphire is not limited to the ring and may be a pendant 6 as shown in Figs.7 and 8. The sapphire may have a recess in the upper surface thereof or be spaced from the diamond by a gap which is filled with a transparent or semi-transparent resin material. Even if the gap is not intentionally made, a small space exists in between and shall preferably be filled with a transparent or semi-transparent resin material. It would be understood that the present invention is not limited to the rings and pendants of the foregoing embodiments but may be applied to ear rings, bracelets, and other ornaments. The present invention allows any yellowish diamond to be rendered by the color of a back-up gem so that it looks like a higher color grade diamond. Also, any other gems or stones properly polished and faceted than diamonds may be backed up by desired color materials for correction of their own tints. The desired color material is not limited to sapphires but other deep color gems including ruby will be employed with equal success. The front diamond or gem may be tinted directly on its back facets without using a back-up color material. This allows no need of a back-up material and the back of a jewelry ornament will be free contributing to the ease of assembling operations. It is also a good idea to color the inner wall of a prong mount In this case, the front diamond or gem needs not to be effected and will thus remain intact in the commercial value. In the embodiments of the present invention, the transparent or semi-transparent gem of a jewelry ornament when viewed from the front is tinted by the color of a back-up material to have a desired hue without being treated with radioactive rays and its appearance in color can be determined with hue control. As the result, any low grade gem will be viewed as if it is a higher color grade one. The gem itself remains intact without any particular treatment and will never be affected in the commercial value with its accompanied certificate unchanged.

Claims: A jewelry ornament comprising a transparent or semi-transparent gem (1) and a color back-up material disposed behind the gem (1) characterised in that the color back-up material is a single color gem (2), in that the transparent or semi-transparent gem (1) is spaced by a small gap (S) from the single color gem (2) and in that the jewelry ornament has a support formed with a hole which is behind the single color gem (2).

Inventors: NAKATA TATSUO, UEKI KAZUHIDE, YAMAURA HIROYOSHI, NAKATA, TATSUO, UEKI, KAZUHIDE, YAMAURA, HIROYOSHI
Applicants: YAMAURA HIROYOSHI, YAMAURA, HIROYOSHI
Application year: 1995
Main classification: A44C9
IPC codes: A44C9, A44C17