Question

how was mrs. oakshott connected with the blue diamond
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Answer 1

• During the preparation of the bird for cooking, Mrs. Peterson had discovered a blue diamond in the throat of the goose. This blue diamond is the Blue Carbuncle, a precious stone that is being reported as being stolen from the hotel room of the Countess of Morcar.

• A blue carbuncle, a valuable jewel, is stolen from Lady Morcar, and an innocent workman is charged and remanded in the run-up to Christmas. Holmes gets a visitor, a gentleman who belongs to a Christmas Club putting money by to purchase a goose for his Christmas dinner. Someone has tried to steal his goose. Another member of the club finds the carbuncle in the goose he has bought. Who put it there? Holmes must find out if one family is to avoid a miserable Yuletide.
• The Adventure of the Blue Carbuncle" was first published in the UK in The Strand Magazine in January 1892. It was first published in the United States in the US edition of the Strand in February 1892. The story was published with eight illustrations by Sidney Paget in The Strand Magazine. It was included in the short story collection The Adventures of Sherlock Holmes, which was published in October 1892.