1960's Aqua and diamond halo pendant necklace. 5.50ct natural untreated oval aqua surrounded by 18 round brilliant cut accent diamonds in 14k white gold. 18 inch chain.   1 oval cut blue aquamarine, VS approx. 5.50cts 18 round brilliant cut diamonds, H SI approx. .90cts 14k white gold  Stamped: 14k 8.5 grams Top to bottom: 18.8mm or .75 Inch Width: 15.3mm or 5/8 Inch Depth or thickness: 9.1mm  Total length: 18 Inches