The Tree of Life in colored sandstone, using the colors of the Prince Scale as described in "The Golden Dawn" by Israel Regardie. The sculpture is 10cm high (about four inches).
The four "color scales" of the Kabbalah (King, Queen, Prince, Princess) correspond to the four Kabbalistic worlds: Atziluth, Briah (or Beriyah), Yetzirah, Assiah (or Asiyah). If you're not familiar with the different scales or worlds, then the Queen scale is one you want.
Here are links to all four sculptures: