Vintage Sapphire Beaded Necklace with 18ct White gold Diamond and Sapphire Clasp

7 Strand graduated sapphire bead necklace made up of various shades of sapphire from white through vivid blue to dark blue - black sapphires. The sapphire beads are approx 530 carats. 

The clasp is made up of 18ct white gold with total of approx. 0.036ct natural diamonds grain set in leaf design and an approx. 0.72ct blue oval sapphire set centrally set.