What are at least 3 symbols in the necklace? Explain. And what is the theme explored?

The theme has several possiblities: One should be thankful for what one has. One should not be possessed by material objects. Symbols could include the necklace itself which appears to be expensive and exquisite, but is only paste, thus somewhat fake. Another symbol could be the money he gives her for the dress which has been his to buy a gun; this shows his generosity and his desire to please his wife. Finally, he suggests she wear a flower with the dress; a flower is a symbol of natural beauty and is quite the opposite of the necklace she feels she must have.