18" + 2" extension 14 karat gold plated sterling silver rough cut aquamarine and faceted Blue topaz stones. The circle faceted Blue topaz stones are 8mm and the pear ones measure 6mm x 9mm. The rough cut aquamarine stones from the top to the largest center pendant measure 18mm x 10mm, 6mm x 20mm, and 13mm x 30mm. The necklace's chain is made up of marquise links that measure approximately 4mm x 12mm and are slightly textured. This necklace has a lobster clasp closure. .925 Sterling SilverUsually ships next business day. Holidays and weekends may affect shipment.