A set of five classy art glass dinner cutlery* rests, or place setting holders, by Pukeberg, Sweden.
They're mid century - so circa 1960s/1970s. A lovely dusky blue grey handmade glass rounds with straight low slot down the middle and serrated base - shell like. Two have partial stickers and they come boxed. *Designed to hold the long item shown in the last photo which I'm not allowed to spell out on Etsy! 
They're 4.5cm x 4cm each. Very good with no chips. One has an air bubble. The box is very tatty and incomplete.
Perfect to make up a set with others for entertaining (other colours are available).
Free P&P within the UK.