Help needed: AI keeps making my jewelry giant in product photography generations

I'm using Gemini (via Nanao Banana) to place my silver necklaces into lifestyle backgrounds. The issue is that the AI ignores real-world scale.

It generates my 3cm pendants as if they are giant objects, often matching the size of books in the scene. When I ask it to "make the necklace smaller," it destroys the image quality and warps the shape of the jewelry.

I need the necklace to look exactly like the reference photo I uploaded, just smaller in the scene. Does anyone have a workaround for accurate object scaling in Gemini?

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