unique demantoid gemstone showcasing its vivid green color and brilliant facets on a clean surface

demantoid gemstone green crystal jewelry mineral cut brilliance facets luster natural stone precious jewel clarity shine craftsmanship reflection elegance luxury nature beauty adornment design collection sparkle semi decorative rarity geology earth polished oval vivid gemology antique treasure fashion accessory upscale artisan engagement extraordinary investment color resplendent allure sophisticated refinement