The Transgender Pride Flag was created by US Navy Veteran Monica Helms and made its first appearance at Pride in the year 2000 in Phoenix. It symbolizes diversity in the Trans community as well as the equal rights of this group. 
 
Blue (Aquamarine) - Traditional boy colour symbolism
Pink (Rose Quartz) - Traditional girl colour symbolism
White (White Jade) - Those who identify as intersex, transitioning, or have an undefined gender. 
 
Then the colours repeat starting with pink this time into blue again.