I make these rings from round sterling silver wire. Once I've made the ring I take it through a rolling mill a couple of times to make it flatter, then I take only the tip through the rolling mill several times to give it the teardrop shape. This process gives it an organic, one of a kind look, almost a perfect teardrop shape.
I then saw the ring open and polish the ends so they will go through your piercing smoothly. To finish I mattify it and get it plated in 18k gold.
You can choose from 14g (1.6mm), 16g (1.2mm) and 18g (1mm) thickness and inner diameter 10mm or 8mm Please note that these has been gold plated in Sweden and the swedish 18k gold alloy is a little bit redder than the yellow gold alloys found in southern Europe, the difference isn't huge and I'm not sure how much it shows on different computer screens but I thought it worth to mention. The last picture shows a model wearing this ring in the copper version.: