4 hinge linked panels Box clasp Filigree metalwork Simulated fire opal Weight: 45 grams ) and this bracelet fits comfortably, not too tight or too loose. The markings date this piece to the 1950''s from the Platería FarFan, Mexico City. The balls have no dents or dings and the simulated foil opals have no scuffs or dulling. Imitation opals were common to vintage Mexican jewelry and are typically made of resins and foil to mimic the beauty of opals. The opalescent stones show a lot of fire. Colors are mostly pink, amber and green and reflect with light.