You aristocrat.
According to
this website, the armored arms ("Arm (or Hand) in Armour or Embowed") may refer to "A person with qualities of leadership".
The crown itself may be a "ducal coronet" according to
this website.
The golden orb/circle (possibly a "Bezant/Byzantine Coin
[Also Besant; Gold Roundle]") may refer to "Worthy of trust of treasure." If it is "Tawney/Orange" then it may be a "tennis ball" or a literal "orange" (protestantism? wealth through trade/ability to get rare oranges?) In the third image you linked, the top left orb in the center certainly looks like a literal orange to me.
The "plant" in the crest may actually be "feathers", possibly meaning "(usually ostrich feathers) Sign of obedience and serenity", and "Beauty, power, and knowledge" if they are peacock feathers (I know they don't have that weird eye thing going on).
Definitely something you're going to want to spend a little cash and time on and find out the skinny.