Ultra-realistic 3D Rendering of Four Polished Gemstone Dice Arranged Tightly

Create an ultra-realistic 3D rendering of four polished gemstone dice arranged tightly in a 2x2 formation, with all edges in contact. The dice are viewed from an isometric perspective. One die is translucent green, featuring the number "7" engraved in gold. The remaining three dice are ruby red, sapphire blue, and ivory cream. One of these displays a detailed dragon emblem, while the other two are engraved with the numbers "4" and "12" in metallic silver. Ensure realistic textures for the stones, softly rounded edges, subtle shadows, and a clean beige backdrop.