The Markings!!!!!!!!! Native American Based on the hallmark and visual features, these are vintage branch coral cluster earrings featuring gold-filled hardware. The hallmarks on the earring back provide specific details about the materials and construction: • GRA-LOK: This is likely the maker's mark or a brand name for the specific locking mechanism used on these earrings. • 1/20 12KT G.F.: This indicates the metal is 12-karat gold-filled. • G.F. (Gold Filled) means a solid layer of gold has been mechanically bonded to a base metal (usually brass). • 12KT specifies the purity of that gold layer (50% pure gold). PATENTED: This refers to the patent for the specific "GRA-LOK" earring closure design. © American Rare C... +4 Item Characteristics Material: The orange clusters are branch coral, a popular material in mid-century and vintage jewelry. • Age: Given the "1/20 12KT G.F." hallmark and the style of the "GRA-LOK" hardware, these are typically dated to the mid-20th century (roughly the 1940s to 1960s). • Condition: Gold-filled jewelry is known for its durability, with the gold layer being significantly thicker than gold plating, allowing it to last for decades without wearing through. Key Characteristics • Material: Often made from natural red or orange branch coral, which is sometimes referred to as "precious coral" • Design: These are typically "cluster" or "fringe" earrings, where multiple small coral branches are hung together to create movement.