Model and lifestyle photos are shot to show how a piece wears, not to document it. Lighting warms or cools the apparent color of the metal and stones, camera distance and lens angle change apparent size, and the model's skin tone, hand or neck size, and pose all shift how proportions read. The same ring can look delicate on one hand and substantial on another.
For accurate details, rely on the standard product images in the product details page. Those are shot under consistent lighting and distance across the catalog, so size, color, and finish are comparable from piece to piece. Dimensions and materials are listed alongside them.
If the fit or scale matters for a specific piece, order a sample. It's the best way to confirm how a piece looks in your own photography and on your own models before you list it.