If your jewelry box isn't home to your grandmother's pearls or your great aunt's diamond solitaire, consider beginning your own heirloom tradition. For starters, you probably have a class ring crafted from platinum, yellow gold or white gold -- precious metals that increase in value over time. But if you'd rather shop for traditional jewelry, remember that a classically cut diamond pendant or ruby earrings are still likely to be in vogue 30 years from now. Looking for a more personal touch? Include a stone signifying the baby's birth month (going way past your due date may put a wrinkle in this plan).
If you're the practical type, this next bit of news may be heartening: Nursery furniture, particularly the handcrafted or hand-painted varieties, can become a functional heirloom. Your baby may not use a cradle for more than a few weeks, but, as with precious jewelry, it can also be passed down to future generations.