The gem variety of zoisite known as tanzanite was first discovered in 1967 in Tanzania. Tanzanite is a strongly pleochroic gem, appearing intense blue, violet, or red depending on the direction from which the crystal is viewed and the orientation in which a gem is cut. This magnificent pair of matched tanzanites weigh approximately 30 carats. These modified triangular cut gems exhibit beautifully the highly-prized intense sapphire-blue color with modifying highlights of violet this is sought after. The floral platinum brooch, designed by Harry Winston, Inc. in 1991, has approximately 24 carats of marquise, pear and baguette cut diamonds. The tanzanite “flowers” can be detached and worn as earrings.

Gift of Donald E. and Jo A. Petersen in 2002.


  • Title: Petersen Tanzanite Brooch
  • Creator: Harry Winston
  • Date Created: 1991
  • Type: Brooch
  • Rights: This image was obtained from the Smithsonian Institution. The image or its contents may be protected by international copyright laws. http://www.si.edu/termsofuse
  • External Link: View this object record in the Smithsonian Institution Collections Search Center
  • Weight: 23.54ct
  • USNM Catalog Number(s): G10195
  • Photo Credit: Smithsonian Institution National Museum of Natural History
  • Field: Mineral Sciences

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