US 12,089,703 B2
Jewelry item and method for manufacturing jewelry item
Hideki Moriyama, Tokyo (JP); and Toshinori Miura, Tokyo (JP)
Assigned to JEWELRY MIURA CO., LTD., Tokyo (JP)
Filed by JEWELRY MIURA CO., LTD., Tokyo (JP)
Filed on Nov. 5, 2021, as Appl. No. 17/520,282.
Claims priority of application No. 2021-109116 (JP), filed on Jun. 30, 2021.
Prior Publication US 2023/0000224 A1, Jan. 5, 2023
Int. Cl. A44C 27/00 (2006.01); C22C 5/02 (2006.01)
CPC A44C 27/003 (2013.01) [A44C 27/007 (2013.01); C22C 5/02 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A jewelry item, comprising:
a thin piece member formed from gold (Au)-aluminum (Al) alloy, the thin piece member having a first cross-sectional thickness;
a frame member formed from platinum (Pt)-palladium (Pd) alloy and surrounding a peripheral edge of the thin piece member, the frame member having a second cross-sectional thickness; and
a compound layer interposed between the thin piece member and the frame member, and comprising metal components of the thin piece member and the frame member,
wherein:
the first cross-sectional thickness is less than or equal to the second cross-sectional thickness;
the compound layer includes a first compound layer formed along the frame member and a second compound layer formed along an inside of the first compound layer;
the first compound layer includes a first intermetallic compound comprising 50% by weight or more of gold (Au) and aluminum (Al) and less than 50% by weight of platinum (Pt) and palladium (Pd);
the second compound layer includes a second intermetallic compound comprising 60% by weight or more of gold (Au) and aluminum (Al) and less than 40% by weight of platinum (Pt) and palladium (Pd);
the thin piece member and the frame member are bonded by the first compound layer and the second compound layer;
the first compound layer has a first width in a direction extending from the frame member toward the thin piece member;
the second compound layer has a second width in the direction extending from the frame member toward the thin piece member;
the first compound layer has a first hue extending across the first width;
the second compound layer has a second hue extending across the second width; and
the first hue and the second hue are different and distinguishable in appearance.