South Sea pearls set in 18K gold. The diameter of the pearls is 12-13mm. The pearls have South Sea Pearl's beautiful silk luster and very high quality. The colour of the pearls is the real natural colour of the pearls. The pearls have three smaller natural marks on the surface which are too small to be seen in the product pictures. The pearls that are cultivated come from the South Sea pearl mussel, Pinctada Maxima.