A heart-shaped gold pendant with diamonds and sapphires could have a variety of design elements. Here’s a detailed description for a piece like this:

The heart-shaped pendant is crafted from polished 18k yellow gold, giving it a rich, lustrous glow. The heart shape itself is smooth and gently rounded, with clean, elegant lines. At the center of the heart is a brilliant round-cut diamond, set in a prong or bezel setting, which adds a touch of sparkling contrast to the warm gold.