Luke presents the signet rings to the royal siblings (Sonic's is the real one whilst Sonia's and Manic's are fakes).
The true signet of the rightful future king of Mobius, plus two copies made by a jeweler and metalsmith (on Robotnik's orders, on pain of roboticization).
The signet rings are objects that appear in the AngieYaz/RoseOfSharon reboot of the Sonic Underground television series. They are three signet rings (one real, two fake) given to the Sonic Underground by Luke Periwinkle as part of Robotnik's plan to split the band apart.
History[]
Robotnik had ordered Periwinkle to go to the jewel house of the Royal Hedgehog Palace and steal the actual signet ring (that would be given to Sonic) while Robotnik had ordered a jeweler and metalsmith (under threat of roboticization) to create two copies of the signet based on the original. After the task was done, he gave the three rings to Luke and later locked him in the Prison Tower. After the three triplets rescued him, Periwinkle gave the hedgehogs the three rings. This caused the three of them to argue over which of them would ascend to power. Eventually, though, Sonia and Manic threw away their rings (as they did not glow) while Sonic kept his.