Start on the Nivoda Connect app within your Shopify store and click on the Ring Builder tab.
Scroll down to the Style Metafields and click create
Now open the Search & Discovery app > Customize filters > Add filter >
Style : Product Metafield
Metal : Variant Metafield
> Save.
It should look like this:
Now open the Product > Filter to Types = Setting > Select All > Bulk edit
Click on Column > Scroll down to Metafields > Style and Metal
Select the Style and Metal for each ring > Save
You can then use the Ring builder settings filter