You do not need a complex setup to do good images. Just play with small reflectors and a window light to start with
How to make a lightbox for photographing jewelry
How to make a lightbox for photographing jewelry. | Quirky Oak Artisan Jewelry
The Magic of Bounce Lighting
"How to photograph jewelry: tips from the pros" by Cathleen McCarthy (JJ Buckar ring photographed by John Parrish)
Five tips for photographing jewellery by Catherine Hicks on the Folksy blog. #photography #photographytips
Photographing Your Jewelry: Tips on What To Do (and What Not To Do) for Great Photos - Jewelry Making Daily - Blogs - Jewelry Making Daily
How to Photograph Your Jewelry in a Better Light: Tips from Professional Photographer Azur Mele
Resin Obsession - Random thoughts about photographing your resin jewelry for sale
Natural Light Jewelry Photography with the Modahaus Portable Studio Set Up
For photographing jewelry - ways to prop up background items
simple way to get good jewelry photos with white paper + a window with natural light! @Mary Duncan
Photographing Jewelry and Clothes For Stylebook
Wonderful, detailed tips for photographing jewelry from TableTopStudio, makers of the EZcube light tent.
light-box-for-photographing-jewelry-21279538 This is the one I will try. The site has interesting ideas & tips in the blog comments.
A personal favorite from my Etsy shop https://www.etsy.com/listing/217020836/black-and-gold-tiny-druzy-necklace-geode