Estate David Webb Geometric Sloped Cocktail Ring in 18k yellow gold with 28 brilliant diamonds set in platinum. Similar to Webb's current model from the '57th Street' collection, Diamond Skylight ring which retails for $26,500. 
 
Designer: David Webb 
Weight: 25.8 grams 
Width: 22.5mm 
Size: 6
Main Stone: Diamond
Diamond Weight: (28) 1.27 cttw 
Metal / Purity: 18k Yellow Gold and platinum 
Hallmarks: Makers Plat 18k
Approx. Year: 1970-80's
Condition: Pre-Owned, Excellent condition, Normal signs of wear 
Country of Origin: USA