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Silver glasses are those which have silver included in the manufacturing process. Hence they come out more costly that the "ordinary" glasses. Double Helix glass company in America makes a well known range and their base is here Double Helix A silver glass ring top, Psyche glass on the outside and one of the TAG (Trautman Art Glass in Germany) glasses in the centre. Sorry I can't remember the TAG name but the rod is a transparent blue.

and a two story ring top I like because of the contrasting colours and simplicity.

The yellow is a BHB from one of Bev's presses Pegasus Lampwork Tools put onto one of Sabine's ( mentioned in previous posts) gizmos and the centre brown is overheated Psyche formed into a ball shaped ring top.
I'm wearing the silver glass ring today. I may change to another colour tomorrow depending on what I fancy.