subdermal LED sapphire pendant, (internal LED glow:1.6), (embedded LEDs:1.7) forming a glowing sapphire-like point beneath the skin at the center of the collarbone, soft radiant light mimicking a gemstone beneath the skin, (sapphire-like glow:1.5), iconic pendant design under the skin, natural skin tone with smooth light diffusion, (high-definition:1.6), (ultra-realistic skin textures:1.7), seamless integration of light beneath the skin, radiant sapphire effect, (worn jewelry:-1.8), (visible pendant:-1.8), (unnatural glow:-1.6), soft light transitions under the skin, modern tech beauty, elegant and versatile for both formal and casual settings