18K Gold 4.05ct Tanzanite & 1.05ct Diamond Ring

Updated September 15, 2026

This auction ended on September 18, 2026. See upcoming auctions from A&B Gemological Services or current jewelry & watches auctions.

Lot number	349
Estimate	11,000.00 - 22,000.00 USD
Category	Jewelry & Watches
Auction	Collector’s Auction SALE – Rolex, Fine Jewelry, Art & Rare F
Date	September 18, 2026 at 8:59 PM PDT
Auction house	A&B Gemological Services
Location	Los Angeles, California

18K White Gold 4.05ct Tanzanite and 1.05ctw Diamond Ring An impressive gemstone ring crafted in solid 18K white gold, featuring a 4.05-carat natural cushion-cut tanzanite surrounded by approximately 1.05 carats of natural diamonds. The center tanzanite displays a vivid violetish-blue color and is secured in a four-prong setting. A halo of round brilliant-cut diamonds frames the center stone, while baguette and round brilliant-cut diamonds continue along the shoulders for added brilliance and dimension. The elevated open gallery allows light to enter beneath the gemstones and highlights the ring’s detailed construction. This item comes with a professional appraisal. Specifications Metal: Solid 18K White Gold Ring Size: 7.50 Total Item Weight: 5.75 Grams Country of Manufacture: USA Estimated Retail Replacement Value: $22,000.00 Reference Number: WAG8800 Main Gemstone Gemstone: Natural Tanzanite Shape: Cushion Cut Quantity: 1 Carat Weight: 4.05 Carats Color Grade: Violetish Blue Clarity Grade: Type I - Eye Clean Cut Grade: Very Good Diamond Accents Gemstone: Natural Diamond Shapes: Baguette and Round Brilliant Cut Total Carat Weight: 1.05 ctw Color Grade: G–H Clarity Grade: SI1–SI2 Total Gemstone Weight: 5.10 ctw Appraisal: Professional appraisal included

18K Gold 4.05ct Tanzanite & 1.05ct Diamond Ring

More lots in this auction

See all lots in Collector’s Auction SALE – Rolex, Fine Jewelry, Art & Rare F →