Lydia Playfoot, 16, had filed suit against the Millais School in Horsham, claiming preventing her from wearing the ring constituted an "unlawful interference" with her right to express her faith, Sky News reported Monday.

Playfoot said the court's decision left her "very disappointed."

"Slowly, over time, people such as school governors, employers, political organizations and others will be allowed to stop Christians from publicly expressing and practicing their faith," she told Sky News.

Playfoot and other Christian students had worn the rings at the school as a show of their belief in abstinence from sex until marriage but the school said the objects weren't allowed under its uniform policy and banned the students from wearing them.

Lawyers for the school argued that the rings aren't covered by the same protections as Muslim and Sikh head scarves because they aren't an essential part of the Christian faith.