【Zambia】Weighing 11,685 Carats! The World’s Largest Emerald Rough to be Auctioned

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Editor’s Note

This article discusses the upcoming auction of the “Imboo,” the largest recorded gem-quality emerald rough. The information is based on an announcement from Gemfields Group Limited.

Gemfields 混合品质红宝石拍卖会单克拉均价创历史新高
World’s Largest Gem-Quality Emerald Rough

Gemfields Group Limited, a global leader in colored gemstone mining and marketing, announced that the Imboo emerald, the largest gem-quality rough ever recorded at 11,685 carats, will be offered at its latest top-tier emerald auction held from August 25 to September 11.

Origin and Discovery
 Gemfields祖母绿拍卖会100%成交，销售额3200万美元

The Imboo emerald originates from the Kagem emerald mine in Zambia. It was discovered in the Chama pit by geologist Dharanidhar Seth and veteran miner Justin Banda, and was unearthed on August 3 this year.

Potential and Rarity

While Gemfields did not disclose a pre-sale estimate for the rough stone, Adrian Banks, the company’s Product & Sales Director, commented on its significance:

全球彩色宝石巨头 Gemfields 迷你拍卖会共售出祖母绿480万美元，需求和价格有所改善
“The Imboo has the potential to yield a number of ‘substantial’ fine polished emeralds. A rough stone of such rarity is capable of forming the centerpiece of an entire high jewelry collection.”
Expert Testimony

Jackson Mtonga, Grading Manager at the Kagem sort house, shared his perspective:

Gemfields 11月祖母绿拍卖会“非常令人失望”
“In my thirty years working at Kagem, I have rarely seen anything like this…”
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⏰ Published on: August 30, 2025