Necklace

The set includes a necklace and matching drop earrings.
The necklace has a festoon or layered design, featuring interconnected infinity-like motifs and square-cut stones.
The earrings echo the design elements of the necklace, likely with similar stone settings and shapes.
Finishing: 
The metal components are silver-toned, indicating a silver polish or rhodium plating for a bright, reflective finish.
The stones are meticulously set to maximize sparkle and light reflection, suggesting a high-quality setting technique.
Material:
Metal:
The base metal is likely sterling silver (925 silver) or a similar silver-toned alloy. Some silver-toned jewelry is also gold-plated sterling silver. 
Stones:
The mint green stones are likely Cubic Zirconia (CZ) or American Diamonds (AD), known for their brilliance and affordability compared to natural diamonds and emeralds. The search results also mention turquoise as a possibility for similar designs.