A man came to the Prophet [SAW] and he was wearing an iron ring. He said: "Why do I see you wearing the jewelry of the people of Hell?" He threw it away, then he came and he was wearing a brass ring. He said: "Why do I notice the stench of idols from you?" So he threw it away, and said: "O Messenger of Allah, what should I use?" He said: "Silver, but it should not equal a Mithqal."  

أَنَّ رَجُلاً جَاءَ إِلَى النَّبِيِّ ﷺ وَعَلَيْهِ خَاتَمٌ مِنْ حَدِيدٍ فَقَالَ مَا لِي أَرَى عَلَيْكَ حِلْيَةَ أَهْلِ النَّارِ فَطَرَحَهُ ثُمَّ جَاءَهُ وَعَلَيْهِ خَاتَمٌ مِنْ شَبَهٍ فَقَالَ مَا لِي أَجِدُ مِنْكَ رِيحَ الأَصْنَامِ فَطَرَحَهُ قَالَ يَا رَسُولَ اللَّهِ مِنْ أَىِّ شَىْءٍ أَتَّخِذُهُ قَالَ مِنْ وَرِقٍ وَلاَ تُتِمَّهُ مِثْقَالاً