Chalcedony. A Semi-valuable gemstone named after the nearby town of Chalcedon, and is particularly bought in most of Istanbul's multitude of jewellery shops. Today, most metro stations do not have a staffed ticket booth, so you'll need to get hold of your Istanbulkart with the yellow ticket devices. By tram[edit] https://wordpress-kursu-istanbul89012.mybuzzblog.com/16618020/the-smart-trick-of-istanbul-wordpress-that-nobody-is-discussing