Mujalid bin Sa'id bin 'Umayr مجالد بن سعيد الهمداني · The Book on Business

(Another chain) from Abu Hamzah, with this chain of narration, and it is similar.

"On the Day of Khaibar I purchased a necklace that contained gold and jewels for twelve Dinar. I separated it and found that it was worth more than twelve Dinar. I mentioned that to the Prophet (ﷺ) and he said: 'Do not sell it until it is separated.'"