This is a brand new, factory sealed, officially licensed Universal Studios/Jurassic Park necklace. This particular necklace is limited edition. The full edition size is 9,995 total necklaces. Here is the direct quoted description from the manufacturer:

"Lost in time, capture a piece of the island of Isla Nublar and own a replica of the ancient mosquito used to recreate the dinosaurs. Measuring 32mmx21mm, this limited edition unisex amber mosquito necklace is a detailed piece which is individually numbered. Limited to 9,995 worldwide."