Movie House of The Dragon. Early in the series, Daemon gifts Rhaenyra a Valyrian steel necklace with the symbol of Old Valyria, representing her heritage and strength.The properties of Valyrian steel are the result of both folding iron many times to balance and remove impurities, and the use of unknown spells, giving unnatural strength to the resulting steel. Bloodmagic and/or fire magic presumably plays a role in spells used to make Valyrian steel, as all Valyrian sorcery came from blood or fire.

Valyrian steel blades are lighter, stronger, harder, and sharper than even the best castle-forged steel. Nothing holds an edge like Valyrian steel, therefore swords hundreds of years old are sharp as the day they were forged. The blades feature distinctive rippled patterns (similar to real-world Damascus steel), the mark of steel that has been folded back on itself many thousands of times. Most Valyrian steel is dark grey in color, almost appearing black. No common fire, not even dragonflame, can damage Valyrian steel.

all dimension on technical screenshot