An curved arrow pointing right. This giant pearl definitely can't be made into a necklace. The largest pearl found up to this date is on display at the city hall of Puerto Princesa, Philippines.

Figure 1. This giant clam pearl was recovered from a huge Tridacna gigas mollusk in Papua New Guinea. Photo by Lai Tai-An Gem Lab. Natural pearls from various clam species are not as rare as many ...