However in many cases, there are a select few items that withstand the inferno. The average house fire burns at a temperature of about 1,100 degrees Fahrenheit, which isn’t hot enough to destroy most metals and earthly-made substances.And if an item is well-placed and small in size, its chances of survival increase drastically.old melts at a much cooler temperature – about 2,000 degrees Fahrenheit – but that’s enough to survive most house fires. Platinum jewelry is the priciest, so it’s a good thing that the metal’s melting point is just higher than 3,200 degrees Fahrenheit. Sapphire and Ruby also possess extremely high melting points.