Gems, Jewelry, and Precious Metals
Showing 1929 products
![[Pre-owned] K18WG SAPPHIRE Sapphire Ring S1.45ct D0.61ct 4.3g #13](http://koufuku.jp/cdn/shop/files/2000000094359_1.jpg?v=1750923953&width=480)
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![[Pre-owned] PT900 Diamond Ring D1.00ct 4.9g #13](http://koufuku.jp/cdn/shop/files/2000000009629_2.jpg?v=1750923952&width=480)
![[Used] Les Essentielles K18WG DIAMOND RING 3.5g #16](http://koufuku.jp/cdn/shop/files/2000000010465_2.jpg?v=1750923953&width=480)
![[Pre-owned] PT900 Diamond Ring 0.83ct D1.95ct 9.9g #11](http://koufuku.jp/cdn/shop/files/2000000025650_2.jpg?v=1750923953&width=480)
![[Pre-owned] K18WG Diamond Ring 0.50ct 3.3g #11.5](http://koufuku.jp/cdn/shop/files/2000000075334_3.jpg?v=1750923953&width=480)
![[Pre-owned] PT900 Diamond Ring D1.00ct 7.6g #12](http://koufuku.jp/cdn/shop/files/2000000009469_2.jpg?v=1750923953&width=480)
![Used] PT900 DIAMOND RING 0.652ct D0.38ct 5.7g #13](http://koufuku.jp/cdn/shop/files/2000000021676_2.jpg?v=1750923953&width=480)
![[Used] K18WG SAPPHIRE RING Fancy Color Sapphire Ring S3.79ct D0.304ct 7.4g #12 With sorting](http://koufuku.jp/cdn/shop/files/2000000042459_2.jpg?v=1750923953&width=480)
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![[Pre-owned] K18WG Pink Sapphire Ring PS0.42ct D0.35ct 7.5g #12](http://koufuku.jp/cdn/shop/files/2000000043944_2.jpg?v=1750923953&width=480)
![[Pre-owned] K18WG Black Opal Ring BO1.02ct D0.35ct #13.5 with Appraisal](http://koufuku.jp/cdn/shop/files/2000000036571_3.jpg?v=1750923953&width=480)
![[Pre-owned] K18WG Diamond Ring 0.321ct D0.16ct 4.0g #14](http://koufuku.jp/cdn/shop/files/2000000037301_2.jpg?v=1750923953&width=480)
![[Pre-owned] PT900 Diamond Ring 0.597ct, G Color, SI1 Clarity, Good Cut, 4.7g, Size 11](http://koufuku.jp/cdn/shop/files/2000000103198_3.jpg?v=1750923953&width=480)
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![[Pre-owned] K18YG Emerald & Diamond Ring E1.03ct D2.45ct 7.0g #13](http://koufuku.jp/cdn/shop/files/2000000019895_2.jpg?v=1750923957&width=480)
![[Pre-owned] K18/PT850 RUBY Ruby Ring R0.41ct D0.18ct 5.0g #12](http://koufuku.jp/cdn/shop/files/2000000068473_2.jpg?v=1751698229&width=480)
![[Pre-owned] K18YG Pink Sapphire Ring PS1.25ct D1.12ct with GRJ Sorting, 6.7g, #13](http://koufuku.jp/cdn/shop/files/2000000089270_3.jpg?v=1751698229&width=480)
![[Pre-owned] PT950 Burmese Unheated Ruby Ring, R0.77ct D0.70ct, with GIA Report, 3.1g, #11](http://koufuku.jp/cdn/shop/files/2000000021997_3.jpg?v=1751698229&width=480)
![[Pre-owned] K18YG Ruby Ring R0.47ct Diamonds 5.6g #13.5](http://koufuku.jp/cdn/shop/files/2000000042527_2.jpg?v=1751698229&width=480)
![[Used] PT900 STAR RUBY RING Star Ruby Ring SR1.24ct D0.49ct 5.1g #8](http://koufuku.jp/cdn/shop/files/2000000075433_3.jpg?v=1751698229&width=480)
![[Pre-owned] K18YG RUBY Ring R0.70ct D0.56ct 4.7g #11](http://koufuku.jp/cdn/shop/files/2000000043562_2.jpg?v=1751698229&width=480)
![[Pre-owned] K18WG Unheated Ruby Ring R1.09ct D0.26ct with AIGS Certificate, 3.5g, Size 13](http://koufuku.jp/cdn/shop/files/2000000035963_3.jpg?v=1751698229&width=480)
![[Pre-owned] K18WG Heated Ruby Ring R1.27ct D0.39ct with AIGS Appraisal, 2.8g, Size 13](http://koufuku.jp/cdn/shop/files/2000000035840_3.jpg?v=1751698229&width=480)
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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)