Meteorites (mostly Sikhote Alin meteorites) set in sterling silver and sterling silver/14kt gold rings
The Sikhote-Alin was one of the most spectacular meteorite falls in recorded history. Falling February 12, 1947, during daylight, the fireball was seen and heard for over 200 miles by many witnesses. It left a trail of smoke and dust 20 miles long.
When the descending group of meteorites reached an altitude of about 3.5 miles, the largest mass apparently broke up in an explosion. This was an exceptionally low altitude for such an event, about half the altitude at which passenger jets fly.