Quick answer
Every three to five years is the general guidance for most categories, art and jewelry included, though fast-moving markets, rare coins, collector watches, certain memorabilia, sometimes warrant more frequent review. The right cadence depends on how quickly a specific category’s values actually move, not a single fixed rule for every collection.
We build reappraisal into an ongoing schedule as part of the full asset review relationship, rather than leaving it to chance at renewal.