A 15-year anniversary is called a crystal anniversary. Traditional gift choices include tableware, stemware and jewelry made of crystal. As a modern alternative, watches are the gift-giving choice for celebrating the 15-year milestone.
Flowers and gemstones are also assigned to each of the most celebrated anniversary milestones. The rose is the flower and the ruby is the gemstone for the 15th anniversary. The next major milestone is the 20th anniversary. Traditional gifts include china dishes, vases and tea sets, and modern gifts include various types of platinum jewelry. For the 20th anniversary, the flower is the day lily and the gemstone is the emerald.