Chalcedony. A semi-valuable gemstone named after the nearby town of Chalcedon, and is particularly offered in a lot of Istanbul's multitude of jewellery outlets. Nowadays, most metro stations do not need a staffed ticket booth, so you will need to acquire your Istanbulkart from the yellow ticket machines. By tram[edit] https://iswordpressisfree35678.pages10.com/the-definitive-guide-to-istanbul-work-72265878