This is a sterling silver marcasite filigree pendant, similar to vintage Art Deco designs. 

• Material: 925 sterling silver.

• Gemstones: Embellished with small marcasite stones.

• Design: Features an intricate, openwork filigree pattern. 

The "FAS 925 Thailand" hallmark signifies that your pendant is made of genuine 925 sterling silver manufactured for an American jewelry brand.

Hallmark Breakdown

• 925: Indicates the piece is certified sterling silver, composed of 92.5% pure precious silver.

• FAS: Stands for the manufacturer "Designs by FMC, Inc.", a jewelry company founded in New York in 1976. In the early 1990s, they moved production to specialized factories in Thailand and China.

• Thailand: Identifies the country of manufacture, renowned for high-quality filigree and marcasite stonework