The Mona Lisa is considered priceless due to its unparalleled cultural, historical, and artistic significance. However, experts and art market sources estimate its value to be around $860 million to $1 billion if it were ever to be sold, which it is not

. Key points about its worth include:

• The painting was insured for $100 million in 1962, which, adjusted for inflation, corresponds to roughly $1 billion in today's terms

• It is permanently housed in the Louvre Museum in Paris and is not for sale, making any market valuation theoretical

• Its immense value is derived not only from Leonardo da Vinci's mastery but also from its iconic status, mystery, and the millions of visitors it attracts annually

• The French government considers it a national treasure, legally prohibiting its sale

In summary, while the Mona Lisa's monetary worth is estimated to be close to or above $1 billion, it remains effectively priceless and unsellable due to its cultural importance and legal protections.