Answer first
A replica Omega Constellation sold as "white gold and gold" is a two-tone look built on a stainless steel base. The white sections are rhodium or chrome plated steel. The yellow sections are gold plated or PVD coated. The genuine reference uses solid 18k white gold for the case and solid 18k yellow, Sedna, or Moonshine gold for the contrasting parts. No replica reproduces that metallurgy, so a seller who claims solid gold is misrepresenting the product.
What the genuine reference uses
Omega builds the Constellation line in solid 18k white gold, in two-tone versions that pair white gold with yellow or Sedna gold, and in steel. Case sizes across the current line run roughly 36 mm to 41 mm depending on reference. The signature claws sit at 3 and 9 o'clock on the bezel. Dials are sun-brushed, lacquered, or meteorite, with applied indices and a date window at 6 o'clock on most automatic models. Movements are Co-Axial Master Chronometer calibres, METAS certified and rated to 15,000 gauss.
Prerequisites before you inspect
- A 10x jeweler's loupe
- Bright indirect light, not a direct beam
- Reference photos of the genuine white gold and two-tone references
- A kitchen scale accurate to 0.1 g
- A small magnet
How to evaluate one in person
- Weigh the watch on the bracelet. A solid gold Constellation is substantially heavier than a steel one of the same size. Plated steel lands close to the steel figure. A suspiciously light "gold" watch is plated.
- Look for plating wear at the caseback edge, the crown, the clasp, and the links that rub. Plating thins first at contact points and shows a grey or yellowish base underneath.
- Bring the magnet close to the caseback and bracelet. Solid gold does not attract. Thin plating over steel lets the magnet pull slightly, and bare steel links pull hard.
- Read the hallmarks with the loupe. Genuine gold carries a 750 or 18k stamp struck into the metal, alongside the maker's mark. Replica stamps are often laser etched, shallow, and inconsistent in depth.
- Inspect the claws on the bezel. Genuine claws are polished, sit flush against the case flank, and have crisp inner edges. Replica claws are usually thicker, softer, and sit slightly proud.
- Examine the dial print. Applied indices on the genuine watch have sharp facets and sit level. Printed text is clean at 10x. Replica dials show ragged edges, uneven lume fill, and indices that tilt.
- Check the movement through the display back. Look for a rotor engraved with the calibre number and METAS certification. Replica movements are usually unmarked, use a plain rotor, and show rough finishing on the bridges.
- Time the watch over 24 hours against a known reference. A genuine Master Chronometer holds a tight rate. Most replicas drift noticeably and many show a stuttering seconds hand.
The gold question
Gold plating on a replica is measured in microns. It wears through in months, not years, at the crown and clasp. Replating is possible but costs more than the watch, and the finish rarely matches the original tone. Solid gold also holds value and can be sold or traded. Plated steel holds none. If a listing prices a "white gold and gold" Constellation near the cost of a steel replica, the metal claim does not hold up.
Legal and practical limits
Counterfeit watches are seized at import in the United States, and buying or reselling them carries risk of confiscation and civil liability. Replicas also come with no manufacturer warranty, no service network, and no parts support, so a failed movement usually means a full replacement. Treat any "solid gold" claim in this market as unverified until a jeweler tests the metal.