Finest possible quality - definitely special order weapon of status made by master silversmith. 
Absolutely gorgeous, presentation grade solid silver / 18k gold gaucho knife - dagger. 
Set with small rubies and diamonds. 
South american, probably argentinian, circa early 20th century.
Finest hand chased decoration on hilt and on scabbard, fantastic crisp details.
High quality blade, made by oldest and one of the finest solingen company (germany).
Marked on the blade: "friedr. Herder abr. Sohn solingen - alemania". 
Marked on scabbard: 800, 18k .
Guaranteed solid silver (800/1000 silver standard, lower than sterling) with solid 18k gold accents (guaranteed solid gold). 
Set with rubies in griffin's eyes and small diamonds on the side of the scabbard and grip, one diamond at the top of pommel.
Guaranteed real diamonds (electronically tested) and real rubies.
   Size:
About 11 7/8 in. (30.3 cm) long in scabbard.
About 10 3/8 in. (26.4 cm) long out of scabbard.   
Blade is about 5 1/2 in. (14 cm) long.
  Condition: 
Very good original condition with light expected wear and charming indication of age. 
Sharp blade with minor dark spots and scratches. 
Absolutely magnificent, museum grade antique example of iconic south american weapon.