Most fake Rolex gold watches are steel watches with a gold layer. The layer is plating, not a solid gold case. Plating runs 2.5 to 5 microns on common examples. That layer holds about 0.5 to 2 grams of gold on a full-size watch. A solid 18k gold Rolex Day-Date holds about 100 grams of gold. Metal cost on that watch passes $5,000 at recent spot prices. No replica in the $150 to $900 range carries a solid 18k case. Rolex itself uses no plating on gold models. Every gold Rolex case is 18k solid.
How the gold layer is made
Three methods appear on the market.
- Electroplating. The case and bracelet sit in a gold bath. Current deposits gold on steel. Thickness control is weak on low-cost runs.
- PVD coating. Gold color comes from a vapor deposit. The bond is stronger than plating. The layer is thin, often under 1 micron.
- Gold wrap or gold filled. A sheet of 14k or 18k gold is bonded to steel. Thickness reaches 10 to 20 microns. US rules call an item gold filled when gold makes up 1/20 of the total weight.
Weight and density
18k yellow gold has a density near 15.5 g/cm3. Type 316L stainless steel sits at 7.98 g/cm3. A plated steel watch feels light in the hand. Some builders press tungsten alloy into the caseback and mid-links. Tungsten alloy density reaches 18.5 g/cm3. The watch gains heft. Solid gold Day-Date models weigh 170 to 210 grams. Steel copies land at 120 to 150 grams unless tungsten is added.
Three common checks tell you little on their own.
- Magnet test. Gold and 316L steel are both non-magnetic.
- XRF gun. The beam reads 2 to 5 microns deep. A plated case scans as gold.
- Acid test. It cuts through plating and leaves a mark.
A water weight test gives a better number. Weigh the watch dry. Weigh it submerged. Divide the two figures. The result is average density for the whole case. Tungsten and gold land close on that scale. The test separates plating from solid gold better than the others.
Markings
Rolex stamps gold cases with hallmarks and a 750 mark for 18k. Laser etching copies cost a few cents. A stamp proves nothing about metal content.
US law sets a floor for the phrase gold plated. The FTC Jewelry Guides require 175 microinches, or 4.4 microns, of gold before a maker can label an item gold plated. Terms like gold tone and gold finish carry no thickness minimum.
Price bands and what they buy
- $150 to $400. 1 to 3 microns of plating on 316L steel. Weight about 120 to 140 grams.
- $400 to $900. 5 microns, gold wrap on the bezel and mid-links, tungsten added. Weight closer to 170 grams.
- $1,000 and up. 10 microns or more, sometimes a solid 18k bezel. Case and bracelet stay steel.
Wear and care
Plating wears at the clasp, crown, caseback, and lug edges. Those points rub skin, desks, and door frames. Chlorine, perfume, and salt speed the loss. Rinse the watch in fresh water and dry it with a cloth. Replating costs $80 to $200. Daily wear gives a 3 to 5 year run before thin spots show.
Questions for a seller
- Micron thickness of the gold layer.
- Base metal grade: 316L or 304 steel.
- Karat of the plating: 18k or 24k color.
- Weight in grams, in writing.
- Replate policy and cost.