Herkimer Diamond + Black Spinel 9k Gold Pendant NecklaceModern, dramatic, and unique as can be, a sparkling constellation of jet black Spinels paired with a one of a kind Herkimer Diamond pendant are the stars of this breathtaking necklace. At over 500 million years old (!), Herkimer is one of very few rare doubly terminated faceted quartz crystals on the planet. Revered for its impeccable luster and clarity, it helps explain why the word "diamond" comes after it. (And also why it's the absolute closest