Turquoise necklace matching bracelet vintage costume jewelry repro of antique or ancient design query semi-precious turquoise stones& retailer silver

Turquoise necklace & matching bracelet vintage costume jewelry looks like a reproduction of an antique design. Gift from Lynn's UK grandmother to Lynn's mother about 50 years ago. Beautifully crafted pieces of vintage jewelry with lovely pale aqua stones in decorative, antique-look settings. Heavy pieces, hence my initial presumption of actual semi-precious stones (also, a heated needle will not penetrate back of bracelet stones which are open/accessible unlike the decorative rear wrap of the necklace stones). Possibly silver was used for the necklace mounting of these lovely pieces---looks tarnished and is not attracted to a strong magnet (though no markings can be found with magnifier). Necklace is 16" long plus 2 1/4" extension drop chain; the necklace's stones are 3/4" by 1/2". The bracelet is 7 1/2" long plus 3" extension; bracelet's stones are 1 1/4" retailer by 1".

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