Gold is a noble metal, which means it is highly resistant to corrosion and oxidation. It does not react with most chemicals, including water and air. As a result, when the ring was lost in the field for two months, it was not subjected to any chemical reactions that could alter its mass or cause deterioration.

Additionally, gold is a dense and malleable metal that does not wear down easily. Even when buried in soil, it can withstand pressure and environmental factors without losing weight.