|Photos: Tom Wagner, RTL, Getty Images|
According to Point de Vue, the story behind turquoise jewellery goes as following: In 2006, Grand Duchess Maria Teresa handed over a turquoise and diamond tiara and a necklace in the same design as well as another turquoise and diamond necklace to Muriel Prieur, curator of the Grand Ducal collections, as the Grand Duchess wished for them to be brought in a wearable state once again and also for earrings to be made to accompany the pieces.
Anyway, Muriel Prieur has determined that the tiara and the accompanying necklace date back to the 1830's though not much more is known about it apart from that. The article does not mention anything about the bigger necklace and when it was likely made though upon closer inspection, I have to say that certain elements do remind me of the Empire Tiara which has been in the family since 1829. While there are no indications of the turquoises being worn by other Grand Duchesses prior to the current one, Grand Duchess Charlotte apparently already owned the pieces, so they definitely do not seem to be a new acquisitions but rather Nassau family heirlooms.