What's the first thing you see at the top of every jewelry store web page, or perhaps at the top of almost all web pages? Usually the store logo is up there, and usually the logo is also a link back to the home page of the website.
Google's image search relies on some type of indicator to determine what every image or photo is about. For your store logo you should actually name the image the same as your store.
As an example, "John's Jewelry Store" top logo should have the image name johns-jewelry-store-logo.jpg. That image name is descriptive enough for Google to understand who to relate it to and how to relate it to them.
Many jewelers will also have very large images on their home page of products, ads, or their storefront. Each one of these images should also be fully named. The storefront photo should have a name like johns-jewelry-store-storefront-photo.jpg. Other large home page images of jewelry should at least include the name of the jewelry designer, for example chamilia-charm-bracelet.jpg.
You should always keep in mind that image names are more important every day. The online clutter of images increases every day as more people share photos from their smartphones. Every day millions of users are sharing photos from their iPhones with the same "IMG" file name and millions more are sharing photos from their Androids with the same "date format" file name. Google will struggle to decipher these identical named images and reward higher SERP ranking to anyone who dares to be different.
You can stand out from the crowd by naming your images better than most others.