Amber necklace that contains 5 larger pieces of amber, and 25 smaller pieces connected by metal pieces (most likely stainless steel, but I'm not sure). Here's a gallery of photos (it's a OneDrive link) - closeups are taken over a small blacklight lamp https://1drv.ms/u/s!AoiLCHVZ5tgKg_FAfiFdDJ9zpbxljw?e=7kbaeq
Around 80cm/31in., larger pieces are approx. 3cm/1.2in., smaller pieces vary from less than 1cm/0.4in. to 1,5cm/0.6in.
It belonged to my grandmother, so I'd say is at least 40+ years old. As my mother told me, she thinks that it was either bought or brought to her from Russia.
An Amber Necklace, 20th Century, Baltic
composed of 5 larger oval drilled beads interspaced with 25 smaller pieces connected by white metal links, possibly silver.