Gems, Jewelry, and Precious Metals
Showing 1929 products
![[Pre-owned] K18YG Cantera Opal Ring OP6.47ct D0.04ct 8.2g #14](http://koufuku.jp/cdn/shop/files/2000000076782_2.jpg?v=1760667249&width=480)
![[Pre-owned] PT900 Alexandrite Ring, A0.73ct D0.33ct, includes Gem Research Japan sorting, size 11](http://koufuku.jp/cdn/shop/files/2000000021812_3.jpg?v=1760667250&width=480)
![[Pre-owned] PT900 DIAMOND Ring D1.00ct 6.3g #12](http://koufuku.jp/cdn/shop/files/2000000087818_2.jpg?v=1760667249&width=480)
![[Pre-owned] PT900 Opal Ring OP2.49ct D0.60ct 10.1g #15.5](http://koufuku.jp/cdn/shop/files/2000000011332_2.jpg?v=1760667250&width=480)
![[Pre-owned] K18WG Sapphire Ring, S13.31ct D0.55ct, NGL Report, 8.9g, Size 14.5](http://koufuku.jp/cdn/shop/files/2000000095868_3.jpg?v=1760667250&width=480)
![[Pre-owned] K18WG Jadeite Ring J4.99ct D0.56ct, with Japan Gem Sciences Association sorting, 6.1g, Size #12](http://koufuku.jp/cdn/shop/files/2000000044187_2.jpg?v=1760667250&width=480)
![[Pre-owned] PT900 RUBY Ruby Ring R0.36ct D0.08ct 3.6g #12](http://koufuku.jp/cdn/shop/files/2000000106847_2.jpg?v=1760667250&width=480)
![[Pre-owned] PT900 Burmese Ruby Ring, R1.505ct D1.02ct, GIA Report, 8.2g, Size #12](http://koufuku.jp/cdn/shop/files/2000000006680_3.jpg?v=1760667249&width=480)
![[Pre-owned] K18WG JADEITE Ring J4.69ct D0.88ct 6.0g #13](http://koufuku.jp/cdn/shop/files/2000000042824_2.jpg?v=1760667250&width=480)
![[Pre-owned] PT900 Mozambique Unheated Ruby Ring R1.02ct D0.66ct GRS Pigeon Blood, with certificate, 7.4g, size 16](http://koufuku.jp/cdn/shop/files/2000000070766_3.jpg?v=1760667249&width=480)
![[Pre-owned] PT900 BLACK OPAL Ring BO1.65ct D0.56ct 8.4g #10](http://koufuku.jp/cdn/shop/files/2000000088020_2.jpg?v=1760667250&width=480)
![[Pre-owned] Isako Kikuchi Design K18YG GARNET Ring D0.19 GRJ Sorting 11.1g #12](http://koufuku.jp/cdn/shop/files/2000000077826_3.jpg?v=1760667250&width=480)
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![[Pre-owned] PT950 GRS Certified Unheated Burmese Ruby Ring, R1.03ct D0.59ct, 6.7g, Size 12](http://koufuku.jp/cdn/shop/files/2000000018423_3.jpg?v=1760667250&width=480)
![[Pre-owned] K18WG JADEITE Ring J2.051ct D0.77ct 6.4g #14](http://koufuku.jp/cdn/shop/files/2000000040776_2.jpg?v=1760667250&width=480)
![[Pre-owned] K18YG RUBY & DIAMOND Ring R1.20ct D0.23ct 4.6g #7.5](http://koufuku.jp/cdn/shop/files/2000000088013_2.jpg?v=1760667250&width=480)
![[Pre-owned] K18WG Black Opal Ring, BO2.15ct, D0.56ct, 4.0g, Size 13](http://koufuku.jp/cdn/shop/files/2000000034553_2.jpg?v=1760667249&width=480)
![[Pre-owned] PT900 RUBY Ruby Ring R0.38ct D0.30ct CGL Sorting 4.6g #7](http://koufuku.jp/cdn/shop/files/2000000051512_3.jpg?v=1760667250&width=480)
![[Used] PT900 RUBY RING Invisible Setting R0.47ct D0.41ct 8.4g #12](http://koufuku.jp/cdn/shop/files/2000000075525_2.jpg?v=1760667250&width=480)
![[Pre-owned] PT900 Green Tourmaline Ring, 8.98ct, 0.83ct Diamond, 15.4g](http://koufuku.jp/cdn/shop/files/2000000013893_2.jpg?v=1760667250&width=480)
![[Pre-owned] K18YG RUBY & DIAMOND Ring, R0.16ct D0.50ct, 6.1g, Size 9](http://koufuku.jp/cdn/shop/files/2000000047072_2.jpg?v=1760667250&width=480)
![[Pre-owned] K18YG Unheated Purple Sapphire Ring from Madagascar, S3.93ct D1.04ct, with AIGS Certificate, 6.5g, Size #11](http://koufuku.jp/cdn/shop/files/2000000035208_3.jpg?v=1760667250&width=480)
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![[Pre-owned] K18YG GARNET Ring 1.18ct D0.03ct 4.9g #10](http://koufuku.jp/cdn/shop/files/2000000047027_2.jpg?v=1760667250&width=480)
KOUFUKU is an e-commerce site that offers a wide range of products, including jewelry, precious metals, designer bags, designer watches, designer apparel, and tableware. In addition to retail sales, we also provide purchase services.
![[Pre-owned] MITSUKOSHI K18YG Ruby & Diamond Ring R0.79ct D0.82ct 7.8g #12.5](http://koufuku.jp/cdn/shop/files/2000000145907_2.jpg?v=1788151913&width=480)
![[Used] PT900 NO HEAT SAPPHIRE RING Sri Lankan Unheated Sapphire Ring S5.40ct D1.19ct GIA Certificate 10.4g #11.5](http://koufuku.jp/cdn/shop/files/2000000133799_3.jpg?v=1777881348&width=480)
![Used] K18YG ENAMEL PENDANT NECKLACE 13.4g](http://koufuku.jp/cdn/shop/files/2000000134116_2.jpg?v=1778489330&width=480)