David Webb Turquoise, Lapis Lazuli, Diamond And White Enamel Collar Necklace Gold & Platinum

David Webb Turquoise, Lapis Lazuli, Diamond And White Enamel Collar Necklace In 18k Yellow Gold And Platinum.
The necklace consists of 8 graduating in size white enamel elongated links, and 8 graduating in size yellow gold divider links. Each of the dividers inset with lapis lazuli bars. Center white enamel link accented with 3 bezel set oval cabochon cut turquoises, each surrounded by octagonal diamond halo. Remaining 7 white enamel links each decorated with 2 turquoises surrounded by halos. 
Equipped with a box clasp.
Inscribed: David Webb, 18K, 900PT, Numbered.

Diamonds:
254 round brilliant cut diamonds
Total weight: approximately 12.00ct
Color: F-G
Clarity: VS

Gemstones:
17 oval cabochon cut turquoises
8 elongated lapis lazuli

Measurements:
Internal circumference: approx: 14 inches.
Width: 20mm to 13mm.

Weight: 188.5 grams.

Ref# 510-000-1025