Chalcedony. A semi-valuable gemstone named after the nearby town of Chalcedon, which is bought in lots of Istanbul's multitude of jewellery shops. Today, most metro stations do not need a staffed ticket booth, so you will need to get hold of your Istanbulkart with the yellow ticket devices. By tram[edit] https://lukasdoalu.empirewiki.com/9106859/the_definitive_guide_to_istanbul_work