Corrected entry: When they first uncover the drawing and are cleaning it, Brock compares it to a photograph of 'The Heart of the Ocean'. This could not have been a color photograph of a necklace that had been missing since 1912. Color photographs dating from around 1910 were VERY grainy and had little depth and contrast. This picture is obviously in a circa 1930s post art deco style.
Sereenie
13th Feb 2004
Correction: He never has a colour photo, all ones of the necklace are black and white, possibly with a slight sepia tinge.