It has been revealed that the "Yada" stone, owned by Jaloliddin Manguberdi, is housed in the British Museum.

This stone is crafted using carving and engraving techniques and is associated with architectural elements of Islamic culture.

Its dimensions are as follows:

🟦 height — 29 cm
🟦 width — 50 cm
🟦 thickness — 32 cm
🟦 weight — 42.5 kg

The stone was discovered in Iran and purchased at an auction. It is registered in the museum under the number №1990.06.12.1, with an indication that it was made in the years 1230/1231 AD.

The exhibit is described as follows: “This stone narrates the military campaigns of Jalal al-Din Khwarazm Shah in eastern Turkey, northwestern Iran, and Azerbaijan during the last years of his life.”

In the "History of the Four Ulus" by Mirza Ulugh Beg, the stone of poison (jada) is also mentioned. The book states that the Turks used it for divination to protect themselves from evil intentions.