Gold filled*;  back is not engraved.  Approximately 1 1/8" long total length. 
*Gold-filled is an affordable, durable alternative to solid karat gold. It is not an alloy. It is a layered material constructed in two or three layers.
A solid 14kt gold filled cross means:
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The visible surface is real 14kt gold, 
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The core is another metal (nickel-free copper), 
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The gold layer is thick and permanent (not just plated), 
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It looks and wears like solid gold but is more affordable. 
Gold-filled products are legally required to be 5% or 1/20 gold by weight. This 5% is described by the karatage of the gold alloy on the surface.
 
 
                     
                     
             
            