Chalcedony. A semi-treasured gemstone named following the nearby town of Chalcedon, and is particularly marketed in a lot of Istanbul's multitude of jewellery outlets. These days, most metro stations would not have a staffed ticket booth, so you'll need to get hold of your Istanbulkart through the yellow ticket machines. https://mylesxlxjt.ourabilitywiki.com/10166047/istanbul_personal_portfolio_wordpress_theme_for_dummies