Here are some features of delicate heart-shaped stud earrings:

1. Minimalistic Design: These earrings typically have a simple and refined look, with a petite heart shape that makes them versatile and suitable for everyday wear.

2. Material: Commonly crafted from materials like sterling silver, 14K or 18K gold (white, yellow, or rose gold), or sometimes stainless steel. For a more luxurious touch, they might be made of platinum or rhodium-plated metals to prevent tarnishing.

3. Gemstones: While some designs may feature plain metal hearts, others can include small gemstones such as diamonds, cubic zirconia, or colored gemstones like pink sapphires, adding a subtle sparkle.