This is called bonfire glass.
It’s the product of not onlyglass that has gone to sea but, as you can imagine, has been burnt too!
These were found in Dorset where there was a fire at the landfill. This caused a major landslide and the rubbish was washed out the sea!
Remnants of glass and pottery are still collected from around that time.
It’s lucky and rare to find such a match with seaglass but here is a pair of burnt green glass sitting on 24mm sterling silver hoops.