For the gold diamond necklace, larger pearls would complement the opulence of gold beautifully. Therefore, I'd recommend using the 12.8mm orange pearls for the gold necklace. Their size would stand out against the backdrop of the gold setting, creating a luxurious and eye-catching combination.
As for the silver diamond necklace, the brighter and more colorful pearls would harmonize well with the sleekness of silver. In this case, the 12mm would also work wonderfully, providing a vibrant contrast against the silver setting and enhancing its elegance.
Set pearls on an elegant diamond necklace, 43(+4) cm in length.
