1. Plural of marcasite; a pale brass-yellow mineral form of iron sulfide, often used in jewelry and decorative objects.
Usage: Geology/mineralogy term; Often used in jewelry-making and fashion contexts
2. Pieces of marcasite stone or jewelry made from marcasite.
Usage: Common in fashion and decorative arts

Examples

• The antique brooch was studded with marcasites that sparkled under the light.
• Marcasites are often used as affordable alternatives to diamonds in costume jewelry.
• The geologist identified the mineral deposits as marcasites based on their distinctive pale yellow color.
• Victorian-era marcasites remain popular among collectors of vintage jewelry.
• The necklace featured delicate marcasites set in silver.
• Marcasites can tarnish over time if not properly maintained.