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| 背面描述 | Central vignette of a female figure wearing a Santa Claus hat with holly sprigs in her flowing hair, surrounded by snowflakes and scrollwork. To the right, a green outline map of Tanzania with a mining pick-and-hammer emblem. Vertical text panel at left recounts the geological origin of tanzanite. |
| 背面铭文 | 100 TANZANIA TANZANITE RARER THAN DIAMONDS Hundred Gems 100 THIS NOTE IS NOT LEGAL TENDER 100 TANZANITE IS A BEAUTIFUL BLUE-VIOLET VARIETY OF ZOISITE AND IS ONLY FOUND IN NORTHERN TANZANIA IN AFRICA. IT WAS FORMED ABOUT 585 MILLION YEARS AGO DURING GREAT UPHEAVALS IN THE EARTH'S CRUST THAT LATER FORMED MOUNT KILIMANJARO. |
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Tanzania is the only known source of tanzanite, a blue-violet zoisite variety first identified in the Merelani Hills near Arusha in 1967 and subsequently named and commercialized by Tiffany & Co. The stone's scarcity — the mineralized zone spans roughly 7 square kilometers — is what makes it a reasonable subject for a commemorative issue from the country that controls its entire supply.
The December birthstone designation came from a 2002 revision to the American Gem Trade Association's official list, making tanzanite one of the more recently added birthstones to any such calendar — a detail that gives the thematic framing here a fairly short history.