Comments for Art Deco Diamond Engagement Ring Hallmark | Marked "PLAT"

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Art Deco Engagement Ring by Cartier
by: Anonymous

Hi Tad thanks for writing in. Your art deco engagement ring sounds gorgeous!

Art Deco originated in France in the 1920s and 1930s in protest against the ART NOUVEAU style.

Digital gold testing equipment can determine the gold content or your local jeweller can acid test. Platinum was popular during the art deco period. Platinum is heavy, dense and hard. It is white in color with a grayish caste. Marks for platinum include:

  • plat
  • plat 10% irid
  • 950
  • platinum

    The marks on the ring tell you the metal is made of gold and platinum. Platinum diamond setting most likely.

    The diamond sounds gorgeous! A Hexagonal brilliant cut diamond is a diamond having a crown and a pavilion, spaced by a girdle, and has an overall hexagon configuration, which is the signature of the stone. Facets are cut in the crown of the stone defining an hexagon table and an hexagram in the crown.


    Feast your eyes on this astonishing Art Deco Platinum Ruby & Diamond ring by CARTIER Paris , 1925. Property of a well known lady. It is set with an unheated eye-clean "pigeon blood" Mogok Burma Ruby of a mixed Hexagonal shape.



    best wishes,
    Yvonne Hammouda-Eyre
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