Can I sell a diamond I found on the ground?

Could you elaborate on the legal implications and ethical considerations surrounding the sale of a diamond that you found on the ground? Are there any specific regulations or laws that might prohibit such a sale? Additionally, how can one ensure that the diamond is not stolen property or subject to any ownership claims? Would it be necessary to obtain a certificate of authenticity or appraisal before attempting to sell the diamond? Furthermore, what steps should be taken to ensure that the sale is conducted in a transparent and ethical manner?