Beautiful American diamond set in emerald green, baby pink, mint silver, and plain silver with necklace and earrings
You included the snippet swatch.liquid with the name of a product option — 'Color' — that does not belong to your product.
Use {% include 'swatch' with 'name of your product option here' %}
Example: {% include 'swatch' with 'Color' %}
This is case-sensitive! Do not put in 'color' if your product option name is 'Color'.