If a Navratna, or gemstone or birthstone is lost or stolen
then it is considered a good omen in Hindu Astrology. There is nothing bad
about a lost gemstone. This is strictly for those who wear ring for overcoming
bad positioning of planets or navagrahas in horoscope.
It is believed that a lost Navratna indicates malefic impact
of the planet in horoscope is over.
Navratna should always be kept safely. It should not be carelessly put around.