Necklace With Colored Stones

Splendid necklace in 18K yellow gold, Italian work from the 70s - 80s, set with 5 citrines, 6 peridots, 6 aquamarines, 3 amethysts, a pink quartz and 62 brilliant-cut diamonds.
Necklace length: 44.9 (cm)
Necklace weight: 31.6 gr.
Estimated rose quartz weight: 2.71 ct. approx.
Estimated total citrine weight: 18.38 ct. approx.
Estimated total amethyst weight: 6.67 ct. approx.
Estimated total peridots weight: 4.74 ct. approx
Aquamarines estimated total weight: 9.31 ct. approx
Total estimated diamond weight: 0.62 ct. approx.
Rose quartz size: 12.02 X 8.05 X 4.86 (mm) (2.71 ct.)
Citrine fancy cut size: 28.02 X 11.99 X 8.07 (mm) (12.62 ct. .)
Dimensions oval citrines: 9.04 X 6.98 X 4.81 (mm) (3.28 ct.)
Dimensions pear citrines: 9.06 X 6.45 X 4.23 (mm) (2.48 ct .)
Trillion amethyst dimension: 10.02 X 10.37 X 6.24 (mm) (3.21 ct.)
Oval amethyst dimensions: 8.63 X 6.87 X 5.21 (mm) (3.46 ct .)
Dimensions round peridots: 6.04 X 6.04 X 3.35 (mm) (4.74 ct.)
Dimensions round aquamarines: 6.16 X 6.16 X 4.00 (mm) (2, 40 ct.)
Small oval aquamarine dimensions: 9.01 X 7.09 X 5.00 (mm) (3.70 ct.)
Large oval aquamarine dimension: 12.46 X 8.45 X 5.13 (mm) (3.21 ct.)
Hallmarks: 750