Final answer:
The fraternity symbol described as a diamond shape with a ribbon in the center may be a lapel pin of a Greek letter organization, but without further information, it is difficult to determine the specific fraternity.
Step-by-step explanation:
The fraternity symbol you're referring to sounds like the badge of a Greek letter organization. These badges are often shaped like diamonds and can include various symbols, but the one with a simple ribbon across the center may be unique to a specific fraternity.
The size and description suggest it's a lapel pin, which is a smaller version of the fraternity's badge worn for everyday attire as opposed to the larger badge typically worn at formal events.
Unfortunately, without a more detailed description or the name of the specific fraternity, it's challenging to provide a definitive answer to which fraternity it belongs.