They are real gemstones, never cubic zirconia or glass stones The personalized initial necklace with birthstone is an elegant, unique necklace and perfect as a personalized gift for her. Your choice of one tiny gold-plated lowercase initial ( a-z ) or uppercase initial (A -Z) and birthstone(s) that hangs on a delicate 18-inch cable chain, you can also add one or many more letters to your necklace. You can add as many initials and/or birthstones to the necklace by purchasing the add on charms option on the link below: https://www.etsy.com/listing/1746378405/custom-birthstone-initial-necklaces D E T A I L S - Materials: 14k gold over sterling silver. The charms and chain are 14k gold THICK plated, and they can last for a very long time with proper care. - All of the birthstones are authentic gemstones, no CZ/ glass beads. - Birthstone charm size: 4mm x 6mm. - Lowercase Initial charm size: 4mm - 7mm; Uppercase initial charm size: 10-12mm. - Chain length: 18-inch. H O W ∙ T O ∙ O R D E R - Select the finish and the choice of birthstone and number of charm(s) in the drop-down menu. You can choose up to 3 letters. - Enter the initials in the box. O T H E R ∙ I N F O R M A T I O N * All items are nicely packaged and ready to gift in elegant jewelry boxes. * If you can't find the information you need or need some advice for your design? Feel free to contact me. I am fast to reply :) T U R N ∙ A R O U N D ∙ T I M E * This design is ready to ship in 1 - 2 business days. This can change during peak seasons. Please check our homepage for the most current times. Thank you so much for visiting and hope you enjoy shopping with us ♡ Liang ♡