A super 1970's Cocktail in textured 18ct buttery to bronzy textured yellow gold. Interspaced with segments of smooth white 18ct gold at the end of which are mounted 6 white brilliant diamonds between 3-3.50 mm diameter .
 The central diamond is larger at 4mm. 
No marks but everything tests as 18ct and diamonds and all is as it should be for the period. 
It is a hand crafted piece.
The ring has sizing pips not uncommon in a large heavy ring . The enable rings to comfortably get over the slightly larger knuckle and prevent the ring swivelling on the finger - if you haven't tried them, they are very comfy things. 
It makes it a little difficult to assess size but I am an N and it is just slightly large - not to large for me to get away with so I would say it is N 1/2 or O.
Quite a statement piece. I'm sure it will get very good comments
Weight 7.6 gms
Head diameter 0.75 inch, 18.5mm 
Diamonds approx 1ct