The 19-year-old singer is searching for a cool piece of jewellery for the 22-year-old country star, reported Daily Star online.
"Harry has been on the phone to leading Los Angeles jeweller Robert Procop, who designed Angelina Jolie's engagement ring. He has been asking advice on what pieces can be made, or what are already available that would suit Taylor," a source said.
"Harry does not want anything too over the top or too ostentatious. But he is happy to splash the cash on a nice ring, not an engagement ring or anything silly like that. He is looking for something traditional," it added.
Styles has also been taking advice from people around him and has also talked to Tiffany's in New York.
"He wants a fun, colourful stone. Harry really is the ultimate romantic