PokéBase - Pokémon Q&A
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From Generation VI onward, only the Normal Gem is obtainable in the core series games. While the Fairy Gem was introduced in Generation VI, it has never been obtainable in any game; it has only ever appeared as unused game data.

Gem (Bulbapedia)

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That says Gen VI & VII. This is Gen VIII.
The gems don't appear in SWSH.