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Have a fancy dinner out with oysters as an appetizer.
Anything adorned with mother-of-pearl or pearl-like accents would be a great way to commemorate the anniversary. This could include jewelry, knives or even cabinet hardware.
Take a laid-back road trip to Tennessee. Along with the usual attractions (like Nashville and the Great Smoky Mountains), visit the Tennessee River Freshwater Pearl Farm.
Give them a mother-of-pearl vase or picture frame.