Do all spells that require a focus need their own dedicated focus, or can you use the same item as a focus for multiple spells as long as it meets the criteria? For example, say you have three spells that as foci, respectively, a gem worth 10gp, a gem worth 50gp, and a clear gem or prism. Would you need to have all those in your inventory, or could you just use one clear gem of 50gp for all three spells?
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There are no general mechanics tying an item used as a focus to a spell after it has been used.
In the case of gems, just make sure the GP values match what each individual spell demands.