^ This. Also, how tight are these shots actually gonna be? Like are we talking microscopic hallmarks on the inside of a ring or just the piece as a whole? I ask because I did a spot for a watchmaker last year and realized my lenses were actually pretty soft once I started cropping in. If you want that clinical look, honestly the Sony FE 90mm f/2.8 Macro G OSS is a beast. Its technically for full frame but works amazing on the FX30. Its super sharp and the OSS helps if you're doing any handheld detail passes. Another decent option if you're tight on space is the Sony FE 50mm f/2.8 Macro. Its much cheaper, around $550 usually, which leaves you cash for a better lighting kit or a slider. The 90mm is the sharper of the two tho, no contest. Just depends on your working distance... the 15mm G is great for general stuff but might feel a bit distorted for high-end macro work.

I'm usually pretty conservative with my gear choices because I hate it when things go wrong on set. Over the years, I've tried many different setups for product work and realized that jewelry is where average glass goes to die. In my experience, if you want that clinical, ultra-sharp look on an FX30, you need to go with native Sony glass for the reliability and peace of mind.

• Sony FE 90mm f/2.8 Macro G OSS: This is my absolute go-to for anything high-end. I used it on a luxury watch shoot last summer and every single tiny detail was tack sharp. It's a full frame lens but it works perfectly on the FX30 crop, which actually helps you stay further back so you dont block your own lights. It's the safest bet for macro work by far.
• Sony E 15mm f/1.4 G: I've used this for wider lifestyle shots and its definitely sharper than your Sigma wide open. But for jewelry commercials? I'd be worried about the wide-angle distortion. Its a fantastic lens, but maybe not for the macro-ish stuff you're planning.
• Sigma 56mm f/1.4 DC DN Contemporary: If you don't need 1:1 macro, this thing is legendarily sharp. I found it resolves detail better than almost anything in its price range, though it wont get you as close as the 90mm. Honestly, I'd go with the 90mm macro. I was a bit of a cautious beginner when I first started doing these big jobs and learned that playing it safe with the industry standard is the only way to sleep at night before a shoot...

Tbh skip the wide lenses for jewelry. You need compression and 1:1 magnification to get those tack-sharp macro details without distortion. The Sigma Art glass is gonna give you more bang for your buck than Zeiss stuff.

• Sigma 105mm f/2.8 DG DN Macro Art Sony E is basically the sharpest macro lens you can get under $1k.
• Sigma 56mm f/1.4 DC DN Contemporary Sony E has insane resolution if you dont need true macro. The 105mm is clinical and fits your budget perfectly.