This is a lovely old box.
It's made of rose quartz, with sterling silver mount.
German silver marks, 925 / 1000.
Inside is silver gilt.
Dimensions: 11,5 x 7,5 cm Hight: 3 cm
Weight: 220 grammes !
Period: 1900 - 1920
Perfect condition, no cracks.
Natural lines in the rose quartz, as usual.
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Here is a converter inches / cm to help you with the dimensions.