Anas reported that when Allah's Apostle (ﷺ) decided to write (letters) to non-Arabs (i. e. Persian and Byzantine Emperors) it was said to him that the non-Arabs would not accept a letter but that having a seal over it; so he (the Holy Prophet) got a silver ring made. He (Anas) said:
I perceive as if I am looking at its brightness in his hand.
Reference: Sahih Muslim 2092 d In-book : Book 37, Hadith 96 USC-MSA web (English) : Book 24, Hadith 5217 (deprecated)
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