Peacock Quartz (Triplet) and Multi Gemstone Dahlia Floral Pendant Necklace 20 Inches in Vermeil Yellow Gold Over Sterling Silver 4.15 ctw This peacock triplet quartz and multi gemstone pendant necklace features a captivating peacock triplet quartz at its heart, surrounded by a halo of multi-colored gemstones that enhance its iridescent hues. This silver necklace is a stunning display of artistry Triplet: Although beautifully colored, some deposits are too thin and fragile to be used for jewelry. However, cementing one of these thin layers onto a strong backing, such as black onyx, black opal, or something similar, creates a doublet or triplet. A doublet is a thin layer of opal glued to a black base. A triplet adds a transparent cap layer.