Getting "like named" products to populate from drop down list

If I have products with the same name in a drop down menu, how can I get their corresponding values to auto populate. If I choose a product that has the same name within the drop down list, it will only return the values of the first listed.

Example: If the first "copper necklace" is chosen from the drop down list it will return, 5 and 2. If the second "copper necklace" is chosen it returns the same values even though the second copper necklace has values of 7,5,7?