Yes Safir 999.9% has a gold content of 999.9‰, which means the gold content of solderless gold. Solder-free gold means that gold does not add any solder during welding, so its purity is higher. Safir Jewelry is known as the "gold in gold" because it pioneered the "solderless welding technology", which made the purity of gold reach over 999.9‰.