This necklace is in the category of the strongest Teri according to the tested results and the P.S.L criteria. Emerging from the warm oceans of Australia, these pearls have been hand selected for their top quality and their strongest Teri brightness and comes with an Authenticity Certificate issued by the Pearl Science Lab of Japan. Pearl Information on the Certificate: Pearl Size: 12.0x15.9mm TERI Analysis: Brightness- Very strong (Highest) Interference colour: Vivid Surface Quality: Very Good Lustre: Excellent Shape: Round Remarks: Reflection Spectroscopy and other tests showed no evidence of staining or dyeing. Knotted between each pearl for safety, the necklace is completed with a solid invisible clasp. One end pearl receives a fine quality screw and the other end pearl a bolt mechanism. The clasp easily functions by gently pushing one pearl against the other and twisting it counter clockwise to unlock, and clockwise to lock. Upon closure, the screws are fully hidden. At the length of 43cm the necklace sits nicely at the collarbone. Packaging: Necklace Jewelry box and an Authenticity Certificate to guarantee the source and quality of the pearls. Insured track and trace delivery UNITED PEARL - OUR EXPERTISE SINCE 1923. Due to our wide range of pearls, its guaranteed quality, and expert knowledge of the market, United Pearl is offering its customers nature’s finest creation with the best Service and Quality. #summerjewellery