Isaac Sardo Abendana

Isaac Sardo Abendana[a] (c. 1662 – 10 May 1709) was a Dutch Jewish jeweller and diamond merchant of Madras, India.

[4] Due to his skill in the cutting, polishing and appraisal of diamonds,[5] Abendana was widely consulted and his advice was well-sought; he became a scientific advisor to most Madras trading companies.

[2][3] A personal friend of then-Governor Thomas Pitt, who also consulted him, Abendana is believed to be responsible for his fortune and for acquiring the Regent Diamond.

[5] Here lies the body of Isᴀᴀᴄ Aʙᴇɴᴅᴀɴᴀ Sᴀʀᴅᴏ of Madras, Hebrew merchant, who died the 10th of May anno 1709, in the 49th year of his age.

[2] According to Professor Walter Joseph Fischel, "[t]he history of his widow [and] her "case" is discussed very extensively in the [court] records.