I've switched over to product options by BSS its free and it may work for you. The other app stopped working for me when I changed my website layout and they wouldn't even get back to me on getting help to fix it. 

Yes I’ve been using that app for 5 months 

I found an app called PRODUCT INFINITE OPTIONS it’s $1.99/month and I’m able to customize like what you are trying to do. They will set up other customizations for you if you have more than one thing that needs customized. I use it for them to select...

I switched over from wix, I ended up finding an app that charges $2 a month and they will set up your variations (no charge) how you’d like them customized. It’s called Product infinite options. I’ve had it for a few months now and it’s been working ...

I’m in that same boat. I have one pendant but a chain length choice. As said above Etsy makes it easy for this option. Then once that pendant is sold it doesn’t leave another variant option in chain length available with that necklace to be sold agai...