Rumors are that the higher than normal gold coloring was chosen deliberately.
President Trump, after all, briefly took gold (3 kg) as rent when APMEX rented offices in one of his buildings. Old story, but may show his affinity to gold:
http://www.marketwired.com/press-release/donald-trump-accept-gold-bullion-lieu-dollars-on-apmex-lease-40-wall-street-1561591.htm