When thinking about wedding rings you should consider opposites: man an woman, negative and positive, black and white, yin and yang, puzzle pieces, bevel and emboss and so on.
We will use brainstorming to generate ideas into a mind mapping. Just write everything that pops into your mind regarding antagonism and opposites.
For example, choose puzzle and think of pieces that work together and that can be combined or matched. Choose square or squares with round edges and play with the shape of the ring. Circle might be too boring, so, imagine other shapes.
Another thing is to use the same, simple form and just to play with the sizes: what would be more refined than a simple circle that fits in a larger one? For sure, you can think later if you will use white gold or other materials.
Then, imagine the masculine as having sharp edges and the feminine ring being soft in edges.
As a nice story about the couple jewelry – I saw somewhere on the internet about a jewelry for couples that was the cast form in gold of a chewing gum. xxx
Another let’s say creative recipe is to use different shapes: the masculine ring would be a square and the feminine would be a circle and these 2 would be sold together as you can see below.
Then, maybe the ring has the same shape but the stone would be different: a cube for him and a sphere for her.
You can think of love messages that are transposed into wire and then worn on the finger. Or the name of the loved one made from golden wire.
Or even, why not, to wear his or her photo on the finger. Or the first kiss or your first photo together printed.
If you want to go technical, maybe the ring has a USB incorporated so that you can connect to a laptop and hear his or her voice anytime saying “i love you”. The device will have in fact the USB as the precious stone as you can see in my drawing.
All these are concepts and you saw what was the process behind. Then, get to the styling part and think about shape, form, color, texture, materials and so on.
Generate as many ideas as possible and then fine tune them having in view the details.