Tanzanite cabochon

18 ct white gold dress ring, with central oval tanzanite cabochon and single halo of rubies surround, featuring:
One claw set oval shaped tanzanite cabochon, 14 mm long x 9.2 mm wide x 4.6 mm deep(estimated)
Eighteen claw set round rubies, colour medium, 2.5 mm x 1.53 mm diameter (estimated)
The band is a narrow, half round, reverse tapered shank with open back, wire basket setting with single halo surround, polished finish
Total weight tanzanite: 5.26 ct
Total weight rubies: 1.11 ct
Total weight of gems: 6.37 ct
Total metal weight: 4.43 gm (estimated)
Total weight of ring: 5.85 gm
Ring size: O (7 1/4)
with valuation for $5372 from 2022
Great condition
A strikingly beautiful and richly regal ring