... steel10x harder than 18k goldHighest melting point of all metals 3780°C9 Mohs hardness scale, second to diamonds ... & night-light function.7.Zirconia ceramic: scratch resistant, wear resistant, drop resistant,corrosion resistant,insulated,high hardness, no skin allergy, shiny and ... links, body jewelry and others relative to jewelry, in metals like stainless steel, titanium, tungsten and ceramic.13) Our ...