This item is rings and can be used for necklace? it is couple style. the size of woman(Width: 4mm) is from 5 to 13? the size of man(Width: 6mm) is from 6 to 13? please select this item according to the size.

1. 100% Brand new and high quality

2. Material:Titanium Steel

3. Color: Black? Silver? Golden

4. Size: 5?6?7?8?9?10?11?12?13 Weight: 5g (US Size)