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I just had look into your store. I observed your banner was scrolled, check it. You can decrease the size of header part then your store looks more awesome.
Check this image https://snag.gy/kY6wQ2.jpg.
And Gallery image sizes are not in equal like this https://nijershop.com/collections/jewelry/products/exclusive-rose-pendant-s925 item.
And I observed some of the items have there is no description and specifications, How customers are decided to purchase the products in your website? You can add item descriptions and specifications. An elegantly composed item description clarifies the advantages of the item and persuades the customer that they need the item as well as need it. Your item description is the one you need to catch their eye to in light of the fact that it can without much of a stretch pull in them and influence them to put in a request. Otherwise, Good work you have done on your store.