Beryl Coronet

The Beryl Coronet is a magnificent royal gold coronet adorned with 39 priceless beryls, serving as the central artifact in 'The Adventure of the Beryl Coronet' from The Adventures of Sherlock Holmes. Stolen from banker Alexander Holder by his wayward nephew Arthur, it is dramatically recovered by Sherlock Holmes after being partially melted down to conceal the crime. Though appearing only in this single story, the coronet exemplifies Holmes' prowess in unraveling financial intrigue and family betrayal, with no further evolution or mentions in subsequent books.