Attache" green tourmaline pendant Modern work

Green tourmaline pendant "Attache Modern work   Convertible two-tone 18k gold brooch pendant featuring a crossed ribbon of white gold set partly with diamonds and centered on a pear-shaped green tourmaline weighing approx. 3.90 cts. A 9k gold pin on the back allows this jewel to be worn as a brooch.   Features : Tourmaline dimensions: approx. 14.1 x 8.5 x 5.7 mm. Pendant dimensions: approx. 2.9 x 2.4 cm. Weight: 6 g (body in 18k - 750/1000 - owl hallmark; pin in 9k gold - 375/1000 - clover hallmark).   Condition: Perfect condition, almost like new. The tourmaline is a beautiful deep green color with yellow tints, very transparent. Two micro-scratches on the edges.