Set of 6 Schott Mainz Tea Glasses and Metal Holders Vintage Jena glass

Set of 6 Schott Mainz Tea Glass and Metal Holders Vintage good condition inside glasses labeled schott mainz - Jena glass metal holder - not sure what metal it is - has diamond shaped pattern one of the glass cups does not have a marking in it and has a slightly different bottom, please see last pic for comparison glasses are 3 1/4" across and 2 1/4" high