Beautiful baroque style sterling necklace with a very large brilliant synthetic color changing alexandrite stone as a centerpiece. Marked NESTOR 925 and STERLING MEXICO. 1940s, without an eagle mark. The stone changes color from intense warm purple under daylight and yellow light, to violet blue under white light.
15 inches wearable length by 1/2 inch wide along the sides. The centerpiece is 3 1/2 inches wide by 2 inches long. Excellent condition. On the back of the centerpiece, visible in photos, there is what looks like a lacquered finish, some of which has worn off. It was never on the front or the back of the chain and does not show at all when the piece is worn. Photos enlarged to show detail.