It was narrated the Fadalah bin 'Ubaid said: "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 (ﷺ) and he said: 'It should not be sold until it is taken apart."
Source: sunnah.com
Other translations
Arabic
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا اللَّيْثُ، عَنْ أَبِي شُجَاعٍ، سَعِيدِ بْنِ يَزِيدَ عَنْ خَالِدِ بْنِ أَبِي عِمْرَانَ، عَنْ حَنَشٍ الصَّنْعَانِيِّ، عَنْ فَضَالَةَ بْنِ عُبَيْدٍ، قَالَ اشْتَرَيْتُ يَوْمَ خَيْبَرَ قِلاَدَةً فِيهَا ذَهَبٌ وَخَرَزٌ بِاثْنَىْ عَشَرَ دِينَارًا فَفَصَّلْتُهَا فَوَجَدْتُ فِيهَا أَكْثَرَ مِنَ اثْنَىْ عَشَرَ دِينَارًا فَذُكِرَ ذَلِكَ لِلنَّبِيِّ صلى الله عليه وسلم فَقَالَ " لاَ تُبَاعُ حَتَّى تُفَصَّلَ " .
sunnah.com