Read it on Tapas! Lamenting the Future - A Past
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seen from Greece
seen from China
seen from France
seen from Malaysia
seen from Malaysia
seen from Lithuania
seen from Malaysia
seen from Brazil

seen from Portugal
seen from South Korea

seen from Türkiye
seen from Serbia

seen from United States
seen from China

seen from United States
seen from United States

seen from United States
seen from United States
seen from Germany

seen from Saudi Arabia
Read it on Tapas! Lamenting the Future - A Past
First
Next (Hello Amethyst)

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I believe that the amount of male Gems was disproportionate to the amount of females, and that the Crystal Gems were likely a matriarchy. The demise of the Gems is connected to the lack of male Gems, as the population didn't grow when the females had to transfer their life energy and gem to their children due to mortal/Gem reproduction (in Gem/Gem reproduction, the energy is combined from both Gems' magic, and while this does take a toll on each parent's strength, they have a far lesser chance of dying in childbirth).
Either that, or maybe some sort of invasion or banishment. Who knows if all the Gems are even dead? Maybe they're on a separate planet.