While the typical antique lavaliere is content to finish with a sweet little pearl drop, this one cuts loose with 2 1/2 inches worth of swaying sparkle! The longest of the three dangling drops has two faceted stones at the bottom; the others have one; and the lavaliere itself is set with four. I believe the jewels are Bohemian crystals - the name appied to Czech crystals before Czechoslovakia came into existence in 1918 - but there's a possibility they're small genuine amethysts. They flash yellow, as well as purple, in certain lights and amethyst and citrine are chemically the same stone.
Dating of this gorgeous necklace is definitely Late Victorian or Edwardian. Most likely it was made circa 1905-1910, since the delicacy and refinement of Edwardian design are very much in evidence. The curvy shape of the 1/2-inch x 1/2-inch lavaliere also shows strong Art Nouveau influence. The metal, gilt brass, has acquired a lovely patina over the past 100 years, but could be polished more brightly if you prefer that look. Age-appropriate surface wear is of course apparent under high magnification.
The basic chain is 14 inches long, but an extra 2 inches of larger chain allow the wearable length to be as much as 16 inches (plus lavaliere and drops). An early lobster clasp, the earliest I've ever seen, is present. I'd consider it a later addition, except that it's the same color and it shows the same wear.
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