Commercial Transactions (Kitab Al-Buyu)

Narrated Fudalah bin 'Ubaid:

At the battle of Khaibar I bought a necklace in which there were gold and pearls for twelve dinars. I separated them and found that its worth was more than twelve dinars. So I mentioned that to the Prophet (ﷺ) who said: It must not be sold till the contents are considered separately.