If the size option is not available on the product page:
Enter your size in the textbox in the cart.
If your size is not displayed in the drop-down menu:
Choose the alternative "Enter custom size in cart" when choosing your product.
Go to the CART.
Enter your size in the textbox ENTER YOUR RING SIZE HERE ( in mm ) + OTHER REQUESTS in your shopping cart before the checkout.
Click here to go to your cart.
If the exact size you want to order is 17,5mm.
1. Choose "Enter custom size in cart" in the menu when choosing product.
2. Go to shopping Cart and enter e.g. "Size 17,5mm" in the text box.