A stretch bracelet in 8 mm pyrite beads, brass-yellow and properly metallic.
Nothing else in this range looks like metal, because nothing else in this range is a sulfide. Pyrite is iron and sulfur, and it takes a polish that reflects like brass rather than glowing like stone, which is why it reads as jewellery in a way the quartzes do not.
Keep it dry and it keeps its shine. Take it off for showering, swimming and the gym, dry it if it gets caught in the rain, and store it with a little air rather than sealed in a bag. Like anything metallic it will mellow a shade with wear, which is the mineral settling in rather than a fault.
Mineral: Pyrite (iron sulfide, FeS₂)
Crystal system: Cubic
Origin: Not recorded
Hardness: 6 to 6.5 on the Mohs scale; hard but brittle, and reacts to moisture
Treatment: None
Approx. inner circumference: 7 cm unstretched
Bead diameter: 8 mm
Approx. weight: 30 g
Stringing: Elastic, stretch fit
Photographed as an example. These are strung in batches from the same material, so yours will be closely similar in colour and pattern but not the exact bracelet pictured.