The industry recently mourned the death of Scottish geologist Campbell Bridges, 71, the discoverer of tsavorite, who was murdered in a dispute over mining rights in southeastern Kenya.
According to the Associated Press, a mob armed with arrows, spears, and machetes attacked Bridges after he stopped to remove a log from the road.
According to a report from the American Gem Trade Association, his son Bruce also was attacked and sustained serious, but not life-threatening, injuries.
Police in Kenya later arrested six men in connection with the murder, reports said.
The men were arrested near where Bridges and his family mined rare gemstones. They are reported to have knowledge of the other attackers.
Campbell is survived by his wife, Judith; son, Bruce; and daughter, Laura. Condolences may be sent to firstname.lastname@example.org.