Up for your consideration is a 830s silver skonvirke Jugend. I have been told that it is produced by Evald Nilsen.
The stone looks like jade. It measures 5.5 x 8cm. Feel free to ask any question! L Jacobsen Evald Nilsen 830s Silver Skonvirke Brooch Denmark" is in sale since Thursday, July 26, 2018. This item is in the category "Jewelry & Watches\Vintage & Antique Jewelry\Vintage Ethnic/Regional/Tribal\Scandinavian". The seller is "abelone65" and is located in 3118. This item can be shipped worldwide.