The central stone appears to be a natural or lab-created blue sapphire, surrounded by accent diamonds.
The central stone appears to be a natural or lab-created blue sapphire, surrounded by accent diamonds. · Cushion Modified Brilliant for the center blue stone, with round melee accent diamonds in the halo.
Good to Very Good symmetrical checkerboard faceting. Cut

Carat
Estimated at 3.0 to 4.0 carats for the center stone, with approximately 0.50 carats total weight for the accent halo.
Color
Deep royal blue to midnight blue for the center stone; near-colorless (G-I) for the surrounding diamond melee.
Clarity
Eye-clean to slightly included (VS) for the center stone; SI1-SI2 for the small accent diamonds.
Shape
Cushion Modified Brilliant for the center blue stone, with round melee accent diamonds in the halo.
Overall Assessment
An attractive, bold cocktail ring featuring a prominent blue center gemstone accented by a sparkling halo of small diamonds.
Cut Quality
Good to Very Good symmetrical checkerboard faceting.
Brilliance
Moderate to high vitreous luster reflecting well from the checkerboard pavilion.
Fire
Low dispersion compared to diamonds, standard for blue sapphire; higher dispersion in the surrounding diamond halo.
Scintillation
Good flash effect due to the large checkerboard facets on the crown.
Proportions
Medium profile with a well-balanced table and pavilion depth for a cushion shape.
Symmetry
Good alignment of the four-prong cushion setting and halo border.
Polish
Good surface polish with clear facet junctions visible.
Fluorescence
Inert to Faint, typical for natural blue corundum.
Inclusions
Typical internal rutile needles or color zoning potentially present in the sapphire, not readily visible without magnification.
Blemishes
Minor surface wear consistent with everyday ring usage on the metal prongs and surrounding halo.
Origin
Likely mined natural sapphire or standard flame-fusion/flux synthetic corundum common in commercial jewelry.
Treatment Detection
Standard thermal enhancement (heating) is common for commercial blue sapphires; no obvious fracture filling visible.
Estimated Value
1,500 to 3,500 USD depending on whether the center stone is a natural sapphire or synthetic, and the precious metal grade.
Certification Estimate
GIA or IGI if submitted for colored stone identification and origin report.
Investment Potential
Moderate; decorative jewelry value rather than high-tier investment grade.
Similar Diamonds
Classic vintage-style cluster and halo rings featuring cushion-cut center gemstones.
Setting Suggestions
Currently set in a double-frame halo with mixed metals (rose gold bezel accent and white metal prongs/halo); pairs well with white gold or platinum bands.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid harsh ultrasonic cleaners if the sapphire is fracture-filled.
Interesting Facts
The cushion cut combined with a halo was extremely popular during the Victorian and Edwardian eras and remains a timeless classic.