Leopard head is London, date probably 1978 or 79 if upper case script, 60 or 61 if lower. That's if you mean the cartouche is squared off at all...
They look like British hallmarks to me. Funnily enough, I had some silver a month or two back with that same maker's mark. Never found out who it...
Little sapphire chips are surprisingly cheap, so they may well be in base metal. Your coloured metal ones are heat tempered. The Wedgwood will...
I've got some bits I picked up in Hong Kong which are glass - which is what this looks like.
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