At the top of the crest is a crown. This signifies that the Consulate represents a kingdom - the Kingdom of God.
The King of this kingdom is Jesus, who is described as the Lion and the Lamb: the Lion of the Tribe of Judah and the Lamb who was slain and is seated on the throne. (Revelation chapter 5)
In the centre is a shield, we are told to hold up a shield of faith... on the shield is a tower. The bible says "the name of the Lord is a strong tower, the righteous run into it and they are saved". (Proverbs 18:10)
The two olive branches either side of the crest represent the citizens of the kingdom - the King's people. Jew and Gentile Christians, one together in Him. (Romans chapter 11)
At the bottom is a rose. Roses represent love, which is a foundational kingdom principle, but it is also a flower, and Jesus spoke about the flowers of the field and how God provides even for them by dressing them in fine clothes - so how much more will He provide for His people? (Luke 12:27-28)