A single item can be listed with more than one metal type, gemstone or image, and can also fall into multiple jewelry categories.
Example:
This article explains how to list a jewelry item with multiple properties when:
How to list a single jewelry item with multiple properties
How to upload a CSV file containing jewelry items with multiple properties.
For all metals and properties which do not have any other related entities, you can type all the properties into one cell, separating each property with a comma.
If a gemstone has properties relating to it, for example Lab report number, then each gemstone should be on a new row, directly below the item, as follows: