Beautiful green natural stone Artesian necklace aventurine jade agate tourmaline

This is an amazing necklace! There are no designer stamps or marks, it's vintage from an estate find. It is loaded with many different green natural stones, I'm not sure what any of them are. I'm not familiar with natural stones enough to say. So I'm going to put in some suggestions after research of what they could be, if you know PLEASE message me. These could be, green tourmaline, jade, green turquoise, demantoid garnet, aventurine, topaz, prasiolite, tsavorite garnet, raw emerald, peridot, Alexandrite, or other green stones. I have no idea what the bigger focal stones are either, maybe jasper? The light colored round smooth ones are natural stones as well. Beautifully made and very high quality. The total length end to end is 21" long. The gold tone or brass is in good condition, too. listing vintage and new jewelry daily, bundle and save, offers welcome, discounted shipping applied!