An extreme macro shot of an little ancient celestial gemstone, radiating an ethereal glow as it rests against a woman's collarbone. Its depths swirl with a mesmerizing nebula of sapphire and emerald, shifting like a living cosmos. Veins of molten silver crackle within, flickering with unseen power, while flecks of fiery amber shimmer like the last embers of a dying star. The gemstone's raw, asymmetrical edges contrast with its impossibly smooth, glass-like surface, polished by centuries of forgotten hands. Intricate, glowing runes spiral along its facets, pulsating with a silent, arcane rhythm, whispering secrets lost to time. Encased in an elaborate, twisting obsidian setting, the gem seems almost alive, a storm of mystical energy swirling beneath its crystalline shell. The background fades into a velvety abyss, speckled with golden dust, accentuating the otherworldly allure of this celestial artifact.