I'm not entirely sure which specific 'gems anime' you're referring to. There could be various anime that involve gems in their storylines. Some might be about magical gems with special powers that the characters use to fight villains or solve mysteries.
There was no clear answer to the question of what gemstone Olivia should bring during the apocalypse. The search results mentioned a few recommended gemstones for Olivia, such as life gemstones, defensive gemstones, dual attack gemstones, and so on, but there was no unanimous opinion. As a result, it was impossible to determine what kind of gemstone Olivier should bring.
Spirits could tell you stories about lost civilizations. These are the ones that have been forgotten or not fully explored by modern archaeology. They may describe the advanced technology or unique cultures of those vanished civilizations.
To get gems in Anime Story, sometimes you need to progress through the story mode and unlock certain levels or milestones. Another possibility is to watch ads or make in-app purchases if available.
Sometimes, characters in anime stories find gems as rewards for defeating powerful enemies or solving difficult puzzles. It really depends on the specific plot and setting of the story.