Only tried on. It's stretchy, so it's equivalent to sizes 10-13 (Japanese sizes). It's tight if you try to stretch it beyond size 13. The watch has stopped. I don't know if the battery can be replaced. A casual ring featuring a large red stone. I bought it at a street stall, so the craftsmanship may be rough. - Color: Red - Material: Metal - Design: Large jewel-like decoration - Style: Casual - Size: Adjustable Thank you for looking.