Apparel & Accessories > Jewelry > Rings Jewelry > Rings in stock Spinelli Kilcollin Petunia Ring in Sterling Silver/Yellow Gold/Grey Diamonds, Size 6: Made to order. Ready to ship in 8-10 weeks. The key to any ring stack? A diamond sandwich. Spinelli Kilcollin happened to nail it with the Petunia, which is done in sterling silver with a stroke of gold at the sides, linking this totally luxurious trio of bands together. Sterling silver bands Grey diamonds, 1.2cts 18k yellow gold connectors.