Examples of Pearl Sizes
Freshwater 6-7mm, 7-8mm, 8-9mm, 9-10mm, 10-11mm, 11-12mm
Golden South Sea 9-10mm, 10-11mm, 11-12mm, 12-13mm
Tahitian 8-9mm, 9-10mm, 10-11mm, 11-12mm, 12-13mm, 13-14mm
Akoya 6.5-7.0mm, 7.0-7.5mm, 7.5-8.0mm, 8.0-8.5mm, 8.5-9.0mm
White South Sea 10-11mm, 11-12mm, 12-13mm
To see how these different pearl sizes and types compare with each other see the chart on round pearl size comparison