It was listed by Gatsby Jewellery Ltd. Sold pieces stay on Sellingantiques as a record of what has passed through, and the next one is rarely far away.
Gatsby Jewellery Ltd has dated this piece to the 1930s.

EDIT: The matching earrings (photographed) are no longer available.
Cut - Diamond are old cuts. The smaller sapphire is a faceted round cut and the larger is an oval cut.
Colour - Diamonds are G; virtually colourless.

Clarity - Diamonds are VS.
Carat - Each diamond is approximately 0.35. The smaller sapphire is estimated at 0.35, with the feature sapphire weighing in at approximately 9.00 carat.
Circa - 1935.
Condition - Excellent.
Measurements - The large sapphire is 16mm by 12.5mm. Pendant is 39mm from top to bottom. Chain is 15".
Metal - 18k Gold. Tested.
Gatsby Jewellery Ltd has dated this piece to the 1930s.
Gatsby jewellery are a husband and wife team who have years of knowledge and experience in dealing in fine antique jewellery.
You can view the stock and full dealer information on the Gatsby Jewellery Ltd Profile Page