"I really look at what the cities represent. Each tournament feels very different. I try to design jewelry to elicit the feel of that particular stadium," Nussbaum continues. "New York is a loud, bold crowd, so that collection is bit more bold and unapologetic. Paris is all about fashion. Everything there is more refined, more simple and elegant." So what about London? How does one interpret the feel of that event in the form of tennis jewelry? "London is the home of the royals. I tried to make refined pieces and included pearls," Nussbaum explains. Next up for the New York-based designer and self-described tennis fanatic is Melbourne, an event she says has a much different feel than the previous grand slams for which she has designed jewelry. Melbourne she refers to as more masculine and male-oriented. Her vision for the jewelry in that collection is more brash, cutting edge and innovative. GOOG) search -- because people are looking for tennis jewelry online, and that was my opportunity to capitalize on those people searching," Nussbaum says. "I'm really blown away by how successful it has been -- over six figures in six months. It was a huge risk, and it's scary every single day. I am completely by myself. I have no investors or partners. I invested my bank account in this business. But I've been lucky. It was 100% cash-flow positive in the first year."