Squareone is a Canadian company manufacturing rings that are truly unisex. Before buying a ring they are offering a ring sizer for free!
Below is from their website:
"Squaremade is not a conventional jewelry company, nor we strive to become one. We founded Squaremade because traditional jewelry didn’t feel true to us. With an obsession for sourcing the purest materials from all over the world and affinity for the art of minimalist design. Behind a simple design there are always hidden perspectives and radiuses that all perfectly align to create a simple object look like a piece of art. It is a truly humbling experience and an absolute pleasure to be able to work with the best materials and the best team to build a ring that will become uniquely yours."
Something free to fill your drawers :p