Black Hills 10k & 12k Gold Leaves Wreath Brooch By Landstrom's. Black Hills Gold Circular Brooch Pin with Black Hills Gold Leaves and Grape Clusters This Circular 10 karat Black Hills Gold brooch pin symbolizes "Eternity", with 12 karat Black Hills Gold leaves It measures approx 2.6 cm in across. Weighs 3.7 grams. It is fully hallmarked "L" for Landstrom and 10k for gold. Excellent condition with original box and card.