Discovering the largest, most expensive and exceptionally rare gemstones
How about discovering the 5 largest gemstones ever found? These exceptionally rare stones are so valuable that even the world's billionaires can't always get their hands on them. As Elizabeth Taylor famously said: "Since the gems aren't ours, we can only admire them."
Summary:
The "Star of Adam" Blue Star Sapphire
The world's largest sapphire was discovered in 2016 in Sri Lanka, weighing in at 1,404 carats. What makes this gemstone so unique? It displays a distinct six-pointed star pattern when exposed to light, hence its name, the "Star of Adam." Its value is estimated between $100 million and $300 million. This priceless sapphire remains a dream for jewelry lovers, whether they collect bespoke creations or pre-owned jewelry. Its market appeal surged further after Kate Middleton debuted her royal engagement ring: a 12-carat blue sapphire.
The "Guinness Emerald": A World Record Holder
Mined from the Coscuez mine in Colombia, this 1,759-carat emerald is currently owned by Fura Gems. As the largest uncut gemstone on Earth, it naturally holds a place in the Guinness World Records.
Its potential value? $500 million once cut and polished. Remarkably, the Guinness Emerald represents only a fraction of the gems extracted from the Coscuez mine, suggesting that other colossal emeralds may still be buried there. While awaiting a future owner, it is currently held at the Banco Nacional de Colombia.
The "Chaiyo Ruby": A Mysterious Gem
Unearthed in South Asia, the Chaiyo Ruby weighs approximately 109,000 carats—roughly the weight of an eight-year-old child. This gemstone is valued at around $448 million, though its current location remains a mystery.
Rumors suggest that before it vanished in 2000, the Chaiyo was kept in a vault in Laos. It is now speculated to be in either Myanmar or Thailand. Regardless of its whereabouts, the Chaiyo has become a legend among the world's largest and most beautiful precious stones.
The "Bahia Emerald"
The Bahia Emerald is the largest emerald ever discovered in a single host rock, weighing a staggering 1.7 million carats. Mined in Bahia, Brazil, it is currently secured in a vault in Los Angeles. Its value is estimated at nearly $925 million. Much like the Chaiyo Ruby, its history is shrouded in drama; the emerald was stored in New Orleans during Hurricane Katrina in 2005 and narrowly escaped being lost to floodwaters.
It was later stolen and eventually moved to a vault in Southern California in 2008. Following intense legal battles over its ownership, the stone has been under the control of FM Holdings since 2015, before being seized by U.S. authorities. As of 2023, the future of this massive stone—and whether it will ever be used for jewelry—remains uncertain.
Read also: The most expensive gemstones in the world
The "Letseng Diamond"
The largest diamond discovered to date is the "Letseng Diamond," found in a diamond mine in Lesotho, Africa. While its 910 carats may seem small compared to the other giants on this list, its value is immense—roughly $400 million—due to its incredible purity. This rare diamond is nitrogen-free and appears completely flawless to the naked eye.
Gemstones: When Rarity Captivates the World
These exceptional gems prove that beyond their sheer size, it is their rarity that creates such fascinating, and sometimes unbelievable, stories.
