Serena Williams, a 23-time Grand Slam champion, celebrates her victory over US teen Caty McNally on Wednesday at the US Open
Serena Williams GETTY IMAGES NORTH AMERICA / CLIVE BRUNSKILL

Serena Williams has revealed that she donates her match outfits to her charity or a women's shelter.

The glamorous tennis player, who recently launched her first brand at New York Fashion Week — Serena — has now expanded her fashion footprint into fine jewelry.

With an association with global diamond manufacturer K.P. Sanghvi, Serena launched her new venture — Serena Williams Jewelry — with 70 pieces priced between $299 to $9,999. The collection included apropos tennis bracelets, rings, earrings and nameplate necklaces featuring strong messages that fit with Williams's spirit that's intact across all her ventures.

During the launch event, Serena spoke to Fashionista.com, and explained how she decides what to wear on the court and how she test-drives her accessories. Serena also mentioned that since people get to see her the most on a tennis court, she always experiments with the aim of getting a different look every time.

"There are guidelines in tennis as to what you can wear. I always say, 'OK, people probably see me the most on the tennis court. So how do I look my best while I'm sweating and running and grunting and being in dire pain at times? What have I not done?' Which is getting more narrow because I feel like I've done almost everything. I start from that point of view. Then, I look at different fabrics and how they perform, how they do under sweet — heat and sweat — sweet is like a mixture of those words [laughs]!" Serena added.

"I always try to keep one or two of [the outfits after I wear for a match], but the rest, I usually either donate to my charity or if I'm home, I drive it to a women's shelter," the 23-time Grand Slam winner said.

Serena also revealed that she practices with a piece of particular jewelry for a month before she finalizes anything.

"I always pick out my jewelry [for a match] a long time in advance because I always practice in them for at least a month to make sure they're not flopping in my face or twisting on my fingers. So it's my own like testing process and then it goes from there. Usually, if I win wearing a particular jewelry, I'll wear it for a little bit. I've always worn heart necklaces. At one point, I wore a circle. It was weird, but that was a gift. Those are pieces that are always cherished," Serena added.