{"id":584753,"date":"2026-09-23T09:59:14","date_gmt":"2026-09-23T07:59:14","guid":{"rendered":"https:\/\/www.giversogioielli.it\/?page_id=584753"},"modified":"2026-10-07T19:12:51","modified_gmt":"2026-10-07T17:12:51","slug":"tanzanite","status":"publish","type":"page","link":"https:\/\/www.giversogioielli.it\/en\/tanzanite\/","title":{"rendered":"Tanzanite"},"content":{"rendered":"
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Eyebrow: a geological exclusive: a single mine on Earth<\/h3>\n

Tanzanite<\/h1>\n

Tanzanite was discovered in 1967 at the foot of Kilimanjaro, in Tanzania, when a group of Maasai herders noticed unusual blue stones among the rocks of the Merelani hills, near Arusha. Gemologist Manuel de Souza was the one to recognize that these weren’t sapphires, but a variety of zoisite never classified before. The following year, Tiffany & Co. launched its international marketing campaign, calling it “the most beautiful gemstone discovered in 2,000 years.”<\/p>\n[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row et_full_width=”true” et_row_padding=”true” css=”.vc_custom_1588128887000{padding-top: 60px !important;padding-bottom: 60px !important;}”][vc_column][vc_row_inner content_placement=”middle” el_class=”align-center”][vc_column_inner el_class=”small-order-2 medium-order-1″ offset=”vc_col-md-7″ css=”.vc_custom_1766576943890{padding-top: 40px !important;}”][vc_column_text css=””]\n

Why Tanzanite Is So Rare<\/h2>\n

Unlike almost every other gemstone, Tanzanite cannot be found anywhere else in the world: there is only one known deposit, an area of just 20 square kilometers at the foot of Kilimanjaro. No new source has ever been discovered elsewhere, and the remaining reserves make it, according to many industry experts, up to a thousand times rarer than a diamond. It is a rarity that can only be depleted, never replicated elsewhere.[\/vc_column_text][\/vc_column_inner][vc_column_inner el_class=”small-order-1 medium-order-2″ offset=”vc_col-md-5″]\t

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The Secret Behind Its Color<\/h3>\n

Tanzanite’s charm comes from a rare optical phenomenon called trichroism: viewed from different angles, the same stone reveals three distinct colors \u2014 deep blue, violet, and bronze-pink hues \u2014 blending into a play of light impossible to replicate artificially. With a hardness of 6.5-7 on the Mohs scale, it is also a delicate stone to cut, which makes every well-crafted piece even more precious.[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row et_full_width=”true” et_row_padding=”true” css=”.vc_custom_1680879356354{padding-top: 80px !important;padding-bottom: 45px !important;}”][vc_column][vc_row_inner][vc_column_inner][vc_column_text css=””]\n

Natural or Heat-Treated?<\/h3>\n[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner et_column_align=”align-center” equal_height=”yes” el_class=”align-center”][vc_column_inner offset=”vc_col-lg-4″][vc_column_text css=””]Nearly all Tanzanite on the market undergoes heat treatment: the rough stone mined from the hills of Merelani is naturally brown or reddish in color, and it’s a controlled heating process that reveals the intense blue-violet hue we know. This isn’t a deception \u2014 it’s a standard practice, recognized and disclosed throughout the industry for decades, just as it is for most blue sapphires on the market.[\/vc_column_text][\/vc_column_inner][vc_column_inner offset=”vc_col-lg-4″][vc_column_text css=””]This treatment does not alter the stone’s crystal structure in any way, nor does it reduce its value or durability over time: it is an integral part of the finishing process, just like polishing or cutting. The extremely rare, never-heated natural Tanzanites, with their more subtle color, remain highly sought after by collectors and can command even higher prices precisely because of their exceptional rarity.[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row et_full_width=”true” css=”.vc_custom_1680879222423{padding-top: 60px !important;padding-bottom: 60px !important;background-color: #f8f6f4 !important;}”][vc_column][vc_row_inner][vc_column_inner] \n\n\t\t\t