Please Review All Photos As Any Defects Or Issues, If Any, Will Be Shown In The Photos. GSM (Grams per Square Meter) Unknown. Apparently, it was featured in the 1996 edition of Country Home Magazine as labeled on the quilt, please see the photos, the back of the quilt also has a certification label of its authenticity and labeled with the artist name and reads that it's 100% cotton and to clean it hand wash it with lukewarm water.