Vintage French Jet Glass Individually Knotted Bead Necklace

This is a continuous strand (opera or rope length) necklace composed of faceted opaque black glass beads, commonly referred to as French Jet. The beads are approximately 8mm to 10mm in diameter and feature multi-faceted geometric cutting that creates a subtle reflective shimmer across the dark surface. Each bead is meticulously hand-strung and individually knotted on what appears to be a black silk or heavy cotton cord, a technique used traditionally to protect the beads from rubbing and to prevent loss if the strand breaks. The construction lacks a clasp, suggesting it is a 'flapper style' long strand designed to be draped or doubled over the head. The condition is fair to good, with visible evidence of surface wear including minor flea bites and small chips on the faceted edges, which is typical for vintage glass jewelry. Some minor lint and surface dust are present between the knots. This piece likely dates from the early 20th century, specifically the Art Deco period (circa 1920s-1930s), when black jewelry was highly popular. The uniform spacing and secure knotting indicate quality vintage craftsmanship.

I have examined the provided images and description of this continuous strand faceted French Jet glass necklace. The 8mm-10mm beads exhibit the characteristic deep opacity and sharp geometric faceting consistent with early 20th-century glass manufacturing. The individual knotting on black cord is a hallmark of quality 'flapper-era' construction, ensuring both durability and a graceful drape typical of the 1920s Art Deco style. My assessment identifies the condition as fair-to-good; while the structural integrity of the cord appears sound, the presence of 'flea bites' and minor chipping on the facet junctions is noted. These imperfections are common for glass of this age but do marginally limit the value compared to a pristine specimen. Current market demand for Art Deco mourning-style jewelry remains steady, though prices for unbranded French Jet have stabilized. This piece is valued as a high-quality costume accessory rather than a fine jewelry item. Factors impacting the value include the desirable rope length and the laborious hand-knotted detail. Please note that this appraisal is based on visual examination alone. Without a physical inspection, I cannot definitively confirm the material isn't vulcanite or bog oak, though the 'flea bites' strongly suggest the brittle fracture patterns of glass. A physical inspection would be required to verify the cord's tensile strength and to conduct a thermal conductivity test to distinguish the glass from denser polymers or natural jet. Provenance regarding the original owner would further enhance its historical value.