- Dorsey Theodora Double Trillion Lab-Grown White Sapphire Sterling Silver Riviere Necklace - 16.5 inches - Worn Once The sparkle is amazing. I don’t have many occasions to wear it, so I’m seeking a better owner who will enjoy it more often. However, I’m not selling it at a low price as some of the Poshers asked for, so please do not send offers at an insulting price. It’s a very nice tennis necklace that is still sold by Dorsey for over $900, and I have barely worn it. If I don’t find the right buyer, I’ll keep it or gift it to my sister. Reasonable offers are welcome. More details: Crafted from individual 0.25 carat trillion shaped lab-grown white sapphires set in sterling silver, the Theodora rivière makes a striking entrance this season. Metal: Sterling silver Setting: 3-prong Stone Type: Lab-grown white sapphire Stone Shape: Trillion cut Stone Size: 4mm