The Diamond Unicorn is a legendary pet in Adopt Me! that was added on March 20, 2020, as a part of the Star Rewards update. It can be hatched out of a Diamond Egg. The Diamond Egg requires players to maintain a login streak of around 1 year and 3 months, or can be obtained through trading. The other two pets that can be obtained from the Diamond Egg are the Diamond Dragon and Diamond Griffin. When hatching the Diamond Egg players have 33.3% chance on obtaining the Diamond Unicorn.
The Diamond Unicorn is a recolor of the Unicorn. It has a metallic-blue colored body, a golden horn and mane, and tail. Its colors are opposite to that of a pet from the Golden Egg. In the day, the body color of the Diamond Unicorn remains metallic-blue when indoors and becomes silvery-white in certain areas when under the sun. At night, the color changes and its body becomes a non-metallic dark blue color while the mane and tail become a darker yellow.
The Neon version of the Diamond Unicorn glows bright yellow on its mane, horn, and tail.
The Mega Neon Diamond Unicorn glows in the same places as the Neon Diamond Unicorn would, but instead of glowing bright yellow, the Mega Neon Diamond Unicorn glows in a cycle of pink, white, and blue.
- A Neon Diamond Unicorn once got into the game, even though the owners of Adopt Me! said that it was not supposed to be in the game until December 2020. The person could have had a very high daily streak (600-700) days and could have obtained extra Diamond Unicorns from other players with very high login streaks, but it was most likely a hacker. The player was banned from Adopt Me!.
- One of the creator of Adopt Me! Bethink joined an Adopt Me! server and showed people the most popular pets in the game which, including the Mega Neon Diamond Unicorn.
- Unlike the Unicorn, the Diamond Unicorn’s hooves do not glow in Mega Neon or Neon form.