Zendaya has been spotted wearing a ring! But before you go into a meltdown, it’s not one on that finger, although it is still the sweetest jewelry we’ve seen in a while. The “Euphoria” star, who has been in London this month hanging out with boyfriend Tom Holland, recently went for a manicure, which was posted by the nail artist @marinadobyk.nails. In the video, posted on March 20, Zendaya can be seen wearing a gold signet ring engraved with “T” and “H” in a scripted font, which…