I do not what the green stone is - it has beautiful deep color. I wondered if the pin has been altered - there are 2 small irregularities on the back at the bottom of the pin on either side of the stone mounting - you can see this in the last two photos.Unless otherwise specified my items are preowned and vintage - they are not new. I will describe any damage or problems aside from what would be considered normal wear - but you should expect some wear on them. Add me to your favorites list as I have lots of interesting vintage items from local estate sales every week. The item "Vintage Bernard Hertz Denmark 828S Silver Art Nouveau Skonvirke Pin Brooch" is in sale since Thursday, August 25, 2016. This item is in the category "Jewelry & Watches\Vintage & Antique Jewelry\Vintage Ethnic/Regional/Tribal\Scandinavian". The seller is "pq51" and is located in Seattle, Washington. This item can be shipped to United States, Canada, United Kingdom, Germany, Japan, Australia.