Byomkesh tells Ajit that Ramanath was a dangerous jewel thief, who was arrested ten years ago for stealing the sapphire(Neela) from Maharaj Ramendra Singha, which he considered his lucky charm.
Byomkesh guesses that it may be the Maharaj, coming to ask them to investigate the murder of one of his associate, Haripada Rakshit.
Maharaj adds that Haripada asked him if he gave the lost gem back to him now, whether he would give him the Rs.2000 reward.
When police came to search him, Ramanath gave the gem to his fellow prisoner Haripada to hide in a hidden pocket in his throat.
After completing his story, Byomkesh starts to describes the negative effect of the Raktomukhee Neela on Ramanath, trying to panic him.
The story was aired in Hoichoi's Byomkesh (web series) Season 2, Episode 3, starring Anirban Bhattacharya and Ridhima Ghosh.