Chalcedony. A semi-precious gemstone named once the nearby town of Chalcedon, and is particularly bought in a lot of Istanbul's multitude of jewellery outlets. These days, most metro stations don't have a staffed ticket booth, so you'll have to acquire your Istanbulkart through the yellow ticket devices. By tram[edit] From https://elliottylvjt.smblogsites.com/36786221/istanbul-work-options