When choosing a pink diamond engagement ring examine the stone for color consistency to be sure you purchase a quality piece Because of their rarity pink diamonds are more expensive than larger colorless cousins Because of that a smaller carat weight pink diamond will be a larger investment than heavier traditional stones.A pink diamond engagement ring is an unexpected twist to a traditional diamond From light rose to deep magenta a pink diamond is a daring beauty of a gem and provides an ultrafeminine and unique touch to any engagement ring.