The Moissanite stone purchased from San Moissan is authentic Lab created Moissanite and was manufactured by San Moissan Co Ltd. All San Moissan created Moissanite is supported with Limited Lifetime warranty. The Coverage of the warranty is against the defect in material or workmanship. Warranty does not cover any breakage, scratching, lost, stolen and third party alteration of the Moissanite. This warranty covers the stone(s) size 5mm or larger. This Limited lifetime warranty will replace or repair the product without any charges. You will be responsible for shipping charges and San Moissan is not responsible for any loss or damage during the shipment.