To understand the financial disparity between an iced out watch and a plain jane watch, one must examine the baseline cost of production. An enthusiast buys a pre-owned stainless steel Audemars Piguet Royal Oak or Rolex Day-Date. They hand the timepiece over to an independent setter alongside $15,000 to $30,000 in labor and diamond costs. Hundreds of small single-cut or brilliant-cut stones are set into the bezel, case, dial, and bracelet links.
The owner spent baseline acquisition cost plus modification fees, expecting the sum to compound. Instead, the secondary market immediately divorces the watch from its collectible status. The diamonds used in aftermarket jobs are almost universally commercial-grade melee stones, tiny, low-clarity gems with minimal standalone resale value. Wholesale gem traders value loose melee diamonds at pennies on the dollar.
Simultaneously, the original watch case has been irrevocably altered. Metal has been carved away, original factory brushing has been buffed flat, and the sharp bevels executed by master finishers in Le Brassus or Geneva are gone. Collectors evaluate such watches as compromised goods. While the plain jane counterpart appreciates alongside global collector demand, the modified version must be priced at an extreme discount simply to find an eccentric retail buyer willing to take it.