Gold and diamonds convertible necklace - 1940s

18K yellow gold convertible necklace made of a series of hexagons joined together to form a honeycomb shape. It has an overlapping style with a removable "X" section with 10 round shape huit huit cut diamonds,0,20 ct approx., color H, clarity VS. It closes securely with two tongue closures. Hallmarked "750" & “18k".
Length 41 cm + 7 cm. Width 1.1 mm. Weight 79.20 g.
Item condition grading: **** good.