A crown in Afghanistan (see image) bears a strong resemblance to the other Korean crowns which is also evidence of a Scytho-Iranian connection. Additionally, the sophisticated metalworking of the crowns of Silla show that Silla gold smiths held an advanced knowledge of working with gold. Some have even theorized that these advanced goldworking techniques, such as granulation and filigree, came from the Greek or the Etruscan people, especially because Silla tumuli also contain beads and glassware which came from as far away as the Mediterranean Sea. But researches and historical documents suggest a Persian connection or even origin.