Showing 1787 products
![[Pre-owned] K18WG Black Opal Ring, Black Opal 1.44ct, Diamond 0.52ct, 3.1g, Size 13.5](http://koufuku.jp/cdn/shop/files/2000000036588_2.jpg?v=1768800609&width=480)
![[Pre-owned] K18WG Black Opal Ring, BO 1.65ct, D 0.40ct, with CGL Sorting, 4.5g, Size 13](http://koufuku.jp/cdn/shop/files/2000000050294_2.jpg?v=1768800609&width=480)
![[Pre-owned] K18WG BLACK OPAL RING Black Opal 1.67ct, 0.77ct, 0.50ct Diamond 0.20ct 11.0g #11.5](http://koufuku.jp/cdn/shop/files/2000000068831_2.jpg?v=1768806608&width=480)
![[Pre-owned] K18WG BLACK OPAL RING Black Opal 3.31ct Diamond 0.89ct 4.8g #13.5](http://koufuku.jp/cdn/shop/files/2000000034584_2.jpg?v=1768806608&width=480)
![[Used] K18WG BLACK OPAL RING Black Opal Ring BO8.90ct D3.32ct 13.5g #14](http://koufuku.jp/cdn/shop/files/2000000094298_2.jpg?v=1782371149&width=480)
![[Pre-owned] K18WG Black Opal Ring BO4.10ct D0.13ct 3.2g](http://koufuku.jp/cdn/shop/files/2000000045214_7.jpg?v=1741937635&width=480)
![[Pre-owned] K18WG Black Opal Pendant Necklace BO13.45ct S0.65ct D0.04ct 11g](http://koufuku.jp/cdn/shop/files/2000000017617_2.jpg?v=1765161863&width=480)
![[Pre-owned] K18WG Black Opal Ring BO2.10ct D0.40ct 3.4g #13](http://koufuku.jp/cdn/shop/files/2000000043487_2.jpg?v=1750401687&width=480)
![[Pre-owned] K18WG Black Opal Ring 0.79ct D0.16ct 2.7g #13](http://koufuku.jp/cdn/shop/files/DSC_6314.jpg?v=1771668363&width=480)
![[Pre-owned] K18WG Black Opal Ring BO0.50ct D0.20ct 1.7g #13](http://koufuku.jp/cdn/shop/files/2000000036847_2.jpg?v=1750401687&width=480)
![[Pre-owned] K18WG Black Opal Ring, BO 1.01ct, D 0.89ct, 3.8g, Size 13](http://koufuku.jp/cdn/shop/files/2000000039770_2.jpg?v=1750401687&width=480)
![[Pre-owned] K18WG Black Opal Ring, BO 1.211ct, D 0.31ct, 4.1g, Size 13.5](http://koufuku.jp/cdn/shop/files/2000000045238_2.jpg?v=1766219022&width=480)
![[Pre-owned] K18WG Black Opal Ring BO1.85ct D0.28ct 4.0g #12](http://koufuku.jp/cdn/shop/files/2000000045924_2.jpg?v=1750401688&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] K18WG Black Opal Ring, BO 2.46ct, D 0.35ct, 4.1g, Size 13](http://koufuku.jp/cdn/shop/files/2000000039435_2.jpg?v=1750401687&width=480)
![[Pre-owned] K18WG Black Opal & Sapphire Ring, BO 4.10ct, S 1.19ct, with JBS Grading Report, 4.1g, Size #14](http://koufuku.jp/cdn/shop/files/2000000071121_3.jpg?v=1752392449&width=480)
![[Pre-owned] K18WG Black Opal Ring BO0.78ct D0.53ct 4.1g #13.5](http://koufuku.jp/cdn/shop/files/2000000071572_2.jpg?v=1765161777&width=480)
![[Pre-owned] K18WG Black Opal Ring, BO 0.90ct, D 0.15ct, 2.7g, Size 13](http://koufuku.jp/cdn/shop/files/2000000036861_2.jpg?v=1762397785&width=480)
![[Pre-owned] K18WG Black Opal Ring BO1.22ct D0.11ct 3.3g #13.5](http://koufuku.jp/cdn/shop/files/2000000036632_2.jpg?v=1752392568&width=480)
![[Pre-owned] K18WG Black Opal Ring BO1.72ct D0.17ct 3.6g](http://koufuku.jp/cdn/shop/files/2000000036595_2.jpg?v=1766801414&width=480)
![[Pre-owned] K18WG Black Opal Ring, BO 2.29ct, D 0.13ct, 3.4g, Size 13.5](http://koufuku.jp/cdn/shop/files/2000000036830_2.jpg?v=1752392569&width=480)
![[Pre-owned] K18WG Black Opal Ring BO3.80ct D0.58ct 5.4g #12](http://koufuku.jp/cdn/shop/files/2000000069890_2.jpg?v=1766219128&width=480)
![[Pre-owned] K18WG BLACK & COLORLESS DIAMOND RING D1.05ct 8.4g #16.5](http://koufuku.jp/cdn/shop/files/2000000040042_2.jpg?v=1771665668&width=480)
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![[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)