The Earth was Pink Diamond's colony. Everything was going smoothly at first. Kindergartens were incubating their first soldiers. Big, warm pieces of Quartz, like this mountain over here, were being created from its rich minerals with great success. Then -- bam! One of Pink Diamond's very own Quartz soldiers started a rebellion and took it too far.
|—Eyeball, in "Back to the Moon"|
Earth, also known as Crystal System Colony Planet Earth, is an abandoned Gem colony planet and the primary location of Steven Universe. Earth contains many native species, with the dominant, sentient species being humans. This Earth exists in an alternate universe; while it is apparently similar, there are many differences.
Thousands of years before the current time in Steven Universe, Homeworld Gems led by Pink Diamond came to Earth in order to create a colony and exploit its resources. Rose Quartz believed that this was unfair to the life already present on it, and instigated the Rebellion, which drove the Homeworld Gems from Earth. In the intervening years, Earth has become the home of the Crystal Gems, who continue to protect it from Gem-based threats.
As shown in "It Could've Been Great" if the colonies were finished, many more structures would have been built, including 89 Kindergartens, 67 spires, and several Galaxy Warp stations. Only 5% of this was completed according to Peridot. In addition, the Earth was to be hollowed out down to the core, with large sections of the crust removed to make the most of its resources. Due to the Rebellion, this plan was abandoned and replaced with the plans to create a geo-weapon: The Cluster.
Maps of the globe seen in the show consistently depict significant geographical differences from real life Earth:
- The Floridian Peninsula of North America is a series of small islands cut off from the mainland. Otherwise, the physical outline of North America on maps has not changed as drastically as some of the other continents.
- The entire Central American area is fragmented in a large group of islands.
- The eastern side of South America — loosely corresponding to Brazil — is noticeably larger than in real life, jutting out east into the South Atlantic.
- West Africa is now covered by the ocean. In fact, the new west coast of this alternate Africa seems to match up with the shape of the larger east coast of South America — just as in real life, the coasts of Africa and South America visibly seem to match up, because they were pushed apart by moving tectonic plates. It is possible that the mid-Atlantic fault line that separated South America from Africa is further east in the Steven Universe Earth due to differing geologic activity.
- A large island and two smaller islands can be seen off the South Atlantic coast of eastern South America, forming an island chain between it and Africa (ending around where Nigeria would be).
- Iceland does not exist.
- Greenland is slightly further east than in real life, making the Baffin Bay larger.
- Russia is missing a huge chunk of land area in the middle of Siberia — the size of Europe. Conspicuously, it is shaped like a neat circle, and a Gem facility is in the very center of it according to the map in the moon base.
- This Gem facility is at the same place as the Tunguska event(a presumptive meteor air burst in 1908).
- The Indian Subcontinent has been almost bisected horizontally by the ocean, in effect making the southern half a separate island (separated from the mainland only by a long but narrow inlet).
- Similar to India, Australia has been bisected vertically by the ocean, splitting it into two separate islands. The coastlines of the eastern island are what they are like in real life (except for the new western coast), but the ocean has flooded much of the western island.
- Much of southern China's coast has been flooded by the ocean.
- The Balearic Islands look remarkably different, and they are located near the norther coast of Africa, instead of the souther coast of Spain.
- The Great Lakes seem to be more interconnected.
- Japan's islands seem fused together, with the northernmost (Hokkaido) forming a land bridge to mainland Asia through Sakhalin, but it is not clear if they are intentional or just due to the outlines of land masses appearing blurry on a large world map in this animation style.
Homeworld Gems appear to have divided up the Earth in different sections, labeling them as 'Facets'. Each Facet name is followed up with a number which differentiates the several Facets. One of the Colony Plans was to have a Galaxy Warp in each Facet.
- Facet 5 - The Prime Kindergarten is located in Facet 5.
- Facet 6 - Eyeball states that she was in Facet 6 halfway through the Rebellion when Jasper formed.
- Facet 9 - The Beta Kindergarten is located in Facet 9.
There are several historical differences between Earth in the show and Earth in real life.
- Delmarva is a state, in which Beach City is located. In real life, this is just a term for the large peninsula on the east side of Chesapeake Bay, because it is shared by the states Delaware, Maryland, and Virginia.
- In real-life, the US state of Pennsylvania is nicknamed "the Keystone State". In the Steven Universe world, it is officially named "Keystone" (though otherwise it has the same borders as real-life Pennsylvania).
- Kansas is a major hub of the movie industry, with Kansas being the SU's analogue for Hollywood.
- The real life state of "New Jersey" is named simply "Jersey".
- The real life state of "New York" is named "Empire State" (as seen on official road signs). As with Pennsylvania/Keystone, "the Empire State" is the official nickname of New York state in real life.
- Major American cities include Charm City, Wilmingmore and Empire City.
- Charm City is a real-life nickname for Baltimore, Maryland.
- Wilmingmore is a portmanteau of the names of Wilmington, Delaware and Baltimore, Maryland.
- Empire City is their direct geographical analogue of New York City. "Mr. Greg" confirmed that it contains locations like Brooklyn and Bowery, areas in real-life New York City. Culturally/historically, however, "Empire City" is sort of "a fusion of New York City, Paris, and Las Vegas".
- Currency appears different in this timeline: Some coins have Gadsden-like snake symbols or pictures of a woman resembling Pearl. $1 bills have images of an upward-pointing diamond on the left and a Gadsden-like snake symbol on the right. $3 bills also exist in this world.
- Instead of the FBI, there is the Department of Justice: Federal Bureau. Their symbol has 12 stars instead of 13, and instead of a shield surrounded by laurels, a snake is resembling the one from the Gadsden flag, accompanied by a waning crescent moon symbol.
- The Canadian flag is green and white, instead of being red and white.
- Well-known holidays such as Christmas or Halloween do not exist as such in this world (though there are some generically similar holiday periods).
- Judaism still exists in this world.
- Korea exists and shares the same flag as South Korea, though it is unknown if it is split into North and South governments like real life.
Environmental Influences either caused by the gems or by geological differences.
- Pears are not very appreciated and are also very uncommon, growing only on the coasts of Eastern Europe and North Africa.
- The mass production of durian juice would imply that the durian is more common.