This serial number should be a seven-digits long and is provided by Cartier in all glasses to … How can you trace Cartier serial numbers? An authentic pair of Cartier glasses cost at least $600 for acetate rims and up to $3,000 for platinum frames. How to Tell if Dolce & Gabbana Sunglasses Are Authentic, How to Identify Fake Louis Vuitton Watches, How to Determine if a Brahmin Bag Is Authentic. Inside the real Cartier Love ring it says Cartier with engraving, and also it has the serial number specific for the ring, also the ring size.