The triangle/pyramid at the bottom of the circle of gold is the "Gateway" which is platinum and gives the optical illusion of walking into the entrance to the universe.
The waves that feature horizontally to the right of the pendant are also made of Platinum and represent Aquarius as the water carrier
This beautiful piece forms part of a set of 12 that make up the constellations to the zodiac star signs.
Aquarius is the 10th largest constellation in the sky, and the 11th sign in the zodiac.