What is the most valuable item flushed down the toilet?

One of the most valuable items ever flushed down a toilet is a diamond engagement ring, which was accidentally dropped by a woman in 2004 in a bathroom in the UK. Although the exact value of the ring was not disclosed, diamond rings can range significantly in price, often worth thousands of dollars. This incident highlights the potential for valuable personal items to be lost in unexpected ways, prompting many to exercise caution around toilets.