(17) باب بَيْعِ الْقِلاَدَةِ فِيهَا خَرَزٌ وَذَهَبٌ
Fadila b. 'Ubaid (Allah be pleased with him) reported:
I bought on the day (of the Victory of Khaibar) a necklace for twelve dinars (gold coins). It was made of gold studded with gems. I separated (gold from gems) in it, and found (gold) of more (worth) than twelve dinars. I made a mention of it to Allah's Apostle (ﷺ), whereupon he said: It should not be sold unless it is separated.
Reference: Sahih Muslim 1591 b
In-book reference: Book 22, Hadith 115
USC-MSA web (English) reference(deprecated numbering scheme): Book 10, Hadith 3864