Why it happens
General image models do not copy your photo. They redraw the scene, including the jewellery, from what they think a ring or a pendant usually looks like. Small, structured, reflective objects are where that guesswork shows most.
1. Settings
Prongs melt into the metal, a four claw head becomes six claws, a halo appears that was never there. Check: count the claws and compare the gallery with your piece.
2. Stone size
A 0.30 ct solitaire suddenly looks like two carats, or a ring on a hand looks like a bangle. Check: compare the stone to the band width in your original.
3. Stone colour
Sapphires drift purple, emeralds go neon, champagne diamonds turn white. Check: put the image next to the source photo in the same light.
4. Stone count
Pavé lines gain or lose stones, station bracelets get extra stations. Check: count along one row.
5. Metal tone
Yellow gold reads as rose, 14k looks like 22k, silver comes out as white gold. Check: compare the metal against a piece you know.
How our studio prevents it
We built AI Jewellery Studio after these faults kept appearing in our own catalogue. Setting construction, stone proportion, stone colour, stone count and metal finish are locked in every render. Only the light, scene and styling change. And if a render ever does alter the piece, regenerate it: failed renders are not charged.