Later during the week, Kromowidjojo set an Olympic record of 53.05 s in the semifinals of the 100 m freestyle. The next day in the final she followed this up by winning a gold medal in a new Olympic record of 53.00 seconds, ahead of reigning world champion Aleksandra Gerasimenya and Tang Yi. In the 50 m freestyle she qualified fastest for the final with a personal record of 24.07 seconds. In the final she completed the sprint double by winning a gold medal in a new Olympic record of 24.05 seconds, again beating Gerasimenya, as well as training partner and compatriot Marleen Veldhuis. Kromowidjojo was honoured for her performances in the 2012 Holland Heineken House in London.