The boy picked up a black coal, the expert tested it for 10 years before concluding: This is the only treasure in the world

In 1981, in Shaanxi province (China), a boy picked up a 'strange' treasure and brought it to the Shaanxi historical museum. It was not until 10 years later that the secrets of this treasure were revealed.

The boy picked up a "lump of coal" and brought it to the museum

In November 1981, a boy wearing a school uniform went to the Shaanxi Historical Museum because he thought he had picked up a historical "treasure" .

"Hello, I just picked up something that looks a lot like a treasure. Can you check it out?" - The boy said.

The "black lump of coal" was brought by the boy for inspection.

Shaanxi province (China) is home to many ancient cultural relics, where many ancient tombs and valuable treasures of many historical dynasties have been excavated. Therefore, the museum staff was very calm when receiving information from the boy.

However, everyone was startled when the boy took out the "treasure" he had picked up from his school bag. It is not a shiny, sparkling object like jade or gold, but its appearance is no different from coal, black, hard as rock.

When examining the "coal" , museum staff discovered many unusual points. Its exterior is black but very bright, with red letters engraved on it. Through initial inspection by museum staff, this is definitely not coal but a historical treasure.

Experts had a headache for 10 years

Museum experts have never seen treasures of that or similar shape. To clarify, experts began research to determine the origin. This treasure is 4.5cm high, weighs about 75.7 grams, and has 14 sides engraved with ancient characters. The reason it looks like charcoal is because it is made from coal essence, also known as pearl charcoal.

All research by experts here has come to a standstill because there is too little data to learn as well as history books do not mention much.

By 1991, this treasure was displayed in the exhibition room, because of its special shape, it attracted many people's attention. After a period of applying a lot of high technology for analysis, the secrets of the stone were gradually revealed.

Expert concluded: "This is a national treasure, the only one in the world"

In 1991, archeology expert Wang Hangzhang was invited to an exhibition at the Shaanxi history museum. While passing through the exhibition area, he saw a strange black treasure and couldn't help but stop and look at it curiously. When he learned that this treasure had not been clearly identified, he was extremely interested and decided to research its origin himself.

It turns out that this treasure is the "multifaceted seal". This seal has a total of 16 sides, of which 14 sides are engraved.

Its faces are divided into 3 types :

• Type 1 is used in official documents and includes 6 sides.
• Type 2 used in books, includes 4 sides.
• Type 3 is used in letters and has 4 sides.

In other words, in ancient times there was a person who had to process a lot of documents every day and take on many important positions. After a lot of research, he finally found out that the owner of this seal was Doc Co Tin - a general, one of the 8 Great Generals of the Western Wei Dynasty in Chinese history. She is also known as having a "keen eye for choosing a son-in-law", and married four children who all became Queen. The eldest daughter married to Northern Chu Minh Emperor Vu Van Duc and was appointed Empress Minh Kinh. The second daughter, Doc Co Gia La, married Duong Kien and became Queen Van Hien of the Sui Duong dynasty. The fourth daughter married Ly Binh - the son of one of the eight pillars of the Western Wei Dynasty - Ly Ho, gave birth to Ly Uyen, who was later posthumously crowned Queen Nguyen Trinh.

The owner of this seal is Doc Co Tin.

From here, it can be inferred that the "polyhedral seal" dates back to around 540 AD . This "multifaceted seal" is still displayed in the Shaanxi historical museum. Visitors to the museum, every time they see it, can review the glorious life of its owner - general Doc Gu Tin.