There is only one version that is the correct version (as seen in the movie), and that is the Versace 4061 with Smoke Olive, Lite Olive Fade, color code 514/16, which is now almost impossible to find.
Complete your Eva Green (Vesper) look
Eva Green is wearing a Sophie Harley Algerian Love Knot pendant. The Algerian Love Knot necklace is intriguing and slightly mysterious. Worn on the neck with a triple strand chain which drops down from the knot, it compliments Eva Green's enigmatic and seductive beauty. This necklace costs £1898 and can be found at SophieHarley.com. A replica is available at Emitations for $134.99 or at JuliasJewelz for $119.00.
Reference: Versace 4061 - Color: Smoke Olive, Lite Olive Fade (code 514/16)