This is a free form pendent, made with one strand of bright gold and one strand of copper thread. The combination created a "rose gold" appearance.
So you ask, how is "rose gold" made?! Well, put on you safety goggles and get ready for a brief Chemistry lesson in metal alloying.
Pure gold and silver are too soft to use by themselves, so they are alloyed with another metal for strength.
Yellow Golds contains: gold, silver, and copper
White Gold contains: gold and either nickel, manganese, or palladium.
Rose Gold contains: gold and copper
Green Gold contains: gold and silver
Sterling silver contains: silver and copper
Brass contains: copper and zinc
Bronze contains: copper and tin
OK, take of your goggles. Here are some nifty things I found at an estate sale.
I also found a box full of thread, ranging from size 50 to size 10.