An Art Deco turquoise and diamond-set gold oval pendant

An Art Deco turquoise and diamond-set gold oval pendant, of geometric design the large oval turquoise cabochon is set within concentric gold surrounds and a line of diamonds, suspended from a diamond-set circular pendant on fine link gold neck chain. Marked D.A probably for David Anderson and T. L-J 585. The pendant 5.3cm long, the chain 50cm long.