Alexandrite Solitaire Rings for Engagement and Special Occasions Alexandrite solitaire rings are becoming increasingly popular as engagement rings and for other special occasions. The unique beauty and rarity of alexandrite stone make it a perfect choice for anyone looking for a ring that stands out from the crowd. In addition, the color change of Alexandrite is a symbol of the changing nature of love and relationships. It represents the idea that love is not static, but evolves over time, just as the color of alexandrite changes under different lighting conditions.