Closeup of the Carat-System Gem-O-Graph, in which genuine diamonds are shown, ranging in sizes from the tiny one pointer to the full carat (100 points) in the middle of the display box. This enables jewelry store customer to compare size in his or her mind with other sizes, avoiding confusion.

Digital Commonwealth — Boston Public Library

Closeup of the Carat-System Gem-O-Graph, in which genuine diamonds are shown, ranging in sizes from the tiny one pointer to the full carat (100 points) in the middle of the display box. This enables jewelry store customer to compare size in his or her mind with other sizes, avoiding confusion.

[ca. January 1951]

RightsCC0 — Public Domain

CollectionDigital Commonwealth — Boston Public Library

[Information from item housing] Diamonds-- Diamonds

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