Chalcedony. A Semi-valuable gemstone named once the nearby city of Chalcedon, and is sold in a lot of Istanbul's large number of jewellery shops. Nowadays, most metro stations would not have a staffed ticket booth, so you'll have to get hold of your Istanbulkart with the yellow ticket devices. By https://iswordpressisfree23456.blogoscience.com/43372892/the-smart-trick-of-istanbul-wordpress-that-nobody-is-discussing