"On the Day of Khaibar I bought a necklace containing gold and ggems for twelve Dinars. The I took it apart and found that it contatined more than twelve Dinars. Mentiion of that was made to the Prophet and he said: 'It should not be sold until it is taken apart."
Sunan an-Nasa'i Book 44, Hadith 125
← Previous Hadith Muawiyah sold a cup of gold or silver for more than its weight. Abu Ad-Darda' said: "I heard the Messenger of Allah forbid such transactions unless it was like for like."

Sunan an-Nasa'i Book 44, Hadith 124 Next Hadith → "On the Day of Khaibar I got a necklace containing gold and gems, and I wanted to sell it. Mention of that was made to the Prophet and he said: 'Take it apart, and then sell it."'

Sunan an-Nasa'i Book 44, Hadith 126