Product Code SKU7011. 9ct Yellow Gold 6mm x 4mm emerald cut Green Quartz & Diamond Earrings. Quartz is one of those gemstones that come in different colours a lot of the colour variation come from the temperatures and minerals surrounding at the time of formation. Smokey Quartz a deep smoky brown colour which facets and polishes is a favourite with people how favour autumn tones makes a unique and exquisite jewellery piece.Lemon Quartz is slightly green yellow and fresh and attractive stone that will compliment many special occasions or just as every day wear. Green Quartz is a variation of the Lemon Quartz with a translucent green, giving it its own unique properties. Beautifully presented in a gift box.