These handmade copper studs with Citrine would make the perfect gift for a 7th anniversary gift, For someone who has a birthday in November, or any occasion and celebration. They will come in a gift box. November Birthstone. Recycled Copper Clay is a clay-like material which turns into pure, solid copper when fired in the kiln. It is a mixture of micron sized copper powder, water, and organic binder. Citrine Round Cabochon 4mm. Hardness: 7 (Mohs). Beautiful golden colouring. Eye clean. Origin: Brazil. Treatment: heated Sterling silver solder. Rose gold filled ear posts with notch. "1/20 14K" stamped on side. Size: 9.5mm x 0.66mm. Rose gold filled ear scroll/butterfly. "1/20 14K" stamped on back of scroll. Size: 5mm x 4mm Rose gold filled is a solid layer of gold (14k) permanently bonded to a base metal, such as brass. The rose colour is obtained by alloying gold with copper. The minimum layer of gold must equal at least 1/20th the weight of the total item. It is very hard wearing and under normal wear the gold will not peel or flake, unlike gold plate. Stud earrings measurements Approx. 7mm (w) 7mm (H) Earring Pair Weight: 0.59g A patina used. Over time, copper develops a green patina, also seen on the Statue of Liberty in New York City. Caring for your Jewellery. They should not be subjected to any hard blows or rough wear. Sudden change in extreme temperature can also break Crystals in time. You can cleanse with warm soapy water and a soft brush, rinse and towel dry. Avoid harsh chemicals, ultrasonic cleaners, or Steam cleaning as they may damage the stone. They should be kept in a padded jewellery box or bag in a cool, dry location to keep them from getting broken.