One reason for including written treatment disclosure on sales receipts is to

• A. Recognize trade-in value
• B. Confirm stone origin
• C. Increase the sale price
• D. Prove you supplied the information

Answer: (D)

The main idea is that keeping a written treatment disclosure on the receipt creates a record that you provided important information about the stone’s treatment to the buyer. In gemology, treatments can affect value, durability, and care, so it’s ethical and often required to disclose them. Having this disclosure in writing on the sale document offers verifiable proof that the buyer was informed, which helps prevent misunderstandings and protects both parties if questions or disputes arise later. The other options aren’t about communicating and documenting information, so they don’t capture the legitimate purpose of this practice.