Gems, Jewelry, and Precious Metals
Showing 1929 products
![[Pre-owned] K18WG Mozambican Unheated Ruby Ring R2.10ct D0.70ct with GRS Certificate, 5.8g, Size #14](http://koufuku.jp/cdn/shop/files/DSC_2048.jpg?v=1761633681&width=480)
![[Pre-owned] K18YG Ruby Ring R0.92ct D1.45ct 8.3g #16](http://koufuku.jp/cdn/shop/files/DSC_2031.jpg?v=1761632769&width=480)
![[Used] PT900 RUBY RING Ruby Ring R0.45ct D0.24ct 5.8g #7](http://koufuku.jp/cdn/shop/files/2000000017730_2.jpg?v=1759735437&width=480)
![[Pre-owned] K18YG Ruby Ring D1.20ct 6.4g #11.5](http://koufuku.jp/cdn/shop/files/DSC_2026.jpg?v=1761632726&width=480)
![[Pre-owned] PT850 Ruby Ring R0.53ct D0.83ct 5.3g #12](http://koufuku.jp/cdn/shop/files/2000000018690_2.jpg?v=1759735437&width=480)
![[Pre-owned] K18YG Ruby Ring R0.56ct D1.00ct 6.4g #10.5](http://koufuku.jp/cdn/shop/files/DSC_2022.jpg?v=1761632678&width=480)
![[Pre-owned] PT900 Ruby Ring, R1.22ct D0.25ct, CGL Sorting, 9.1g, #15](http://koufuku.jp/cdn/shop/files/2000000013268_3.jpg?v=1759735437&width=480)
![[Pre-owned] K18WG Mozambican Unheated Ruby Ring, R2.00ct D1.51ct, GRS Certified, 6.4g, Size 12.5](http://koufuku.jp/cdn/shop/files/2000000094380_3.jpg?v=1759735437&width=480)
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![[Pre-owned] K18WG Heated-free Ruby Ring, R1.08ct D0.89ct, AIGS Pigeon Blood, 4.1g, Size 12.5](http://koufuku.jp/cdn/shop/files/2000000034508_3.jpg?v=1759735437&width=480)
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![[Pre-owned] K18YG Ruby & Diamond Ring R0.19ct D0.12ct 4.2g #12](http://koufuku.jp/cdn/shop/files/DSC_2005.jpg?v=1761632346&width=480)
![[Pre-owned] PT900 Ruby Ring R1.18ct D0.41ct 7.2g #12](http://koufuku.jp/cdn/shop/files/2000000011608_2.jpg?v=1759735437&width=480)
![[Pre-owned] K18YG Ruby Ring R1.79ct D0.48ct 5.2g #16](http://koufuku.jp/cdn/shop/files/DSC_2035_f0d9386a-7356-4886-a585-bae73d041c1d.jpg?v=1761633128&width=480)
![[Pre-owned] K18YG Pink Sapphire Ring, PS2.12ct D1.20ct, 6.9g, Size 11.5](http://koufuku.jp/cdn/shop/files/DSC_2017.jpg?v=1761632587&width=480)
![[Pre-owned] K18YG Ruby & Diamond Ring R0.69ct D0.05ct 4.5g #12](http://koufuku.jp/cdn/shop/files/DSC_2029.jpg?v=1775189217&width=480)
![[Pre-owned] K18WG Ruby Ring R1.73ct D0.17ct 4.0g #11.5](http://koufuku.jp/cdn/shop/files/DSC_2057.jpg?v=1761633954&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] PT900 Madagascar Unheated Ruby Ring R2.12ct D1.10ct with GRS Certificate, 7.9g, Size 13](http://koufuku.jp/cdn/shop/files/2000000035161_3.jpg?v=1759738422&width=480)
![[Pre-owned] PT900 Ruby Ring R0.756ct D0.53ct, includes NGL sorting, 9.0g, size 12.5](http://koufuku.jp/cdn/shop/files/2000000018089_2.jpg?v=1759738422&width=480)
![[Pre-owned] K18YG Ruby & Diamond Ring R2.75ct D0.75ct 10.0g #11.5](http://koufuku.jp/cdn/shop/files/DSC_2014.jpg?v=1761632530&width=480)
![[Pre-owned] K18WG Madagascar Unheated Ruby Ring R2.07ct D1.22ct with GRS Certificate 4.9g #13](http://koufuku.jp/cdn/shop/files/2000000093659_3.jpg?v=1759738564&width=480)
![[Pre-owned] K18YG Ruby Ring R0.91ct D1.22ct 8.1g #11](http://koufuku.jp/cdn/shop/files/2000000068671_2.jpg?v=1759988719&width=480)
![[Pre-owned] PT900 SAPPHIRE Ring S1.41ct D0.32ct 6.2g #12](http://koufuku.jp/cdn/shop/files/2000000089263_2.jpg?v=1759988718&width=480)
![[Pre-owned] K18YG Sapphire Ring S1.10ct D0.13ct 4.5g #12.5](http://koufuku.jp/cdn/shop/files/2000000106595_2.jpg?v=1759988718&width=480)
![[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)