Logan Sapphire

It is a mixed cushion-cut sapphire, approximately the size of a large chicken egg, and set in a silver and gold brooch surrounded by 20 round brilliant-cut diamonds.

[1][2] It is a mixed cushion-cut sapphire (having a rounded rectangular shape) and is blue with slight shades of violet.

[1] This phenomenon, as well as the slight violet tones, indicates trace amounts of the element chromium in the sapphire's structure.

[2] It is set in a silver and gold brooch and surrounded by 20 round brilliant cut diamonds.

[8] It is a "Ceylon sapphire", a term derived from the former name of Sri Lanka,[3][4] and likely originates from Ratnapura, known as the "City of Gems".

[8][9] A New York jeweler who possessed the sapphire claimed that its first owner was a Sri Lankan native who was beheaded for withholding his discovery from his leader.

She often wore it on a clip at formal events, but the sapphire was so heavy that she had to wear it with a shoulder strap.

[1][10] According to Paul Desautels, the museum's curator at the time, Logan finally parted ways with the sapphire because it reminded her of her late husband's extramarital affairs.