デイビット・ユーマンのインスタグラム(davidyurmanmen) - 10月31日 06時31分

Many Streamline® designs highlight the unconventional beauty and brilliance of black diamonds. Called carbonados in the gemological world, the exceptionally hard material—shown here as a 5.10-carat rough stone—acquires its distinctive opaque hue from the presence of graphite, pyrite and hematine. #DavidYurmanMen

[BIHAKUEN]UVシールド(UVShield)

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