Black square crystal earrings are a bold and sophisticated accessory that adds a touch of elegance with a modern edge. Here are some features and design ideas for black square crystal earrings:

1. Materials:

   • Metals: Typically crafted from sterling silver, rhodium-plated, white gold, or even blackened metals for a sleek, contemporary look. Gold and rose gold settings can also offer a striking contrast against black crystals.
   • Crystals: Black crystals such as onyx, black cubic zirconia, or black spinel are popular choices for a chic and stylish appearance.

2. Design Styles:

   • Classic Square Studs: Simple square studs featuring a single black crystal in a prong or bezel setting for a minimalist and versatile look.
   • Halo Surround: A central black crystal surrounded by a halo of smaller white or clear crystals to add sparkle and highlight the boldness of the black stone.
   • Geometric Patterns: Incorporate additional design elements like geometric shapes or additional stones for a modern and trendy look.