A Fine Quality 18k Yellow Gold Sapphire Diamond Cluster Ring ~ 7.70tcw ~ Rectangular Cut 4.70ct Natural Sapphire No Heat and No Enhancement with AGL Prestige Report ~ 12 Round Brilliant Cut Diamond 3.00tcw ~ English Hallmarks London 1990 Large fine quality sapphire diamond cluster ring ~ Sapphire AGL Certified with No Heat and No Enhancement. Design:- Traditional classic cluster design, the large rectangular emerald cut blue sapphire is surrounded by a row of 12 round brilliant cut diamonds. The sapphire is set fractionally raised above the diamonds giving definition to the center blue sapphire against the comparison of the dazzling white diamonds. The ring is created in 18k yellow gold with the sapphire and diamonds set in platinum. Paperwork/Certificate:- The ring is accompanied by an AGL (American Gemological Laboratories) Prestige Report Gemological Analysis Certificate for the center sapphire. The AGL Gemstone Report is dated May 18th 2011. The Sapphire:- The AGL Gem Gemstone Report states the sapphire as follows:- Identification: Mineral Type = Natural Corundum. Variety = Sapphire. Color Description = Dark Blue. Carat Weight = Estimated 4.7 cts. Measurements = 10.83 x 8.98 x 4.75. Shape = Rectangular. Cutting Style = Emerald Cut. Origin: Provenance = Australia. Enhancements: Standard = No gemological evidence of heat. Additional = Clarity Enhancement: None. The Diamonds:- The center blue sapphire is surrounded by 12 round brilliant cut diamonds with a combined total diamond carat weight of approx. 3.00tcw. The diamonds are of fine quality with color grade range F/G and clarity grade VVS/VS. Ring Size:- American ring size 5½. This ring can be sized. Signatures and Marks:- This ring is stamped with full British Gold Standard Marks and British Assay Mark for London 1990 and 750. Approx. Measurements:- Fits American ring size 5½. This ring can be sized. Approx measurements of the top of the ring 19mm x 16mm. Approx. overall combined weight 9grams. Condition:- This ring is in excellent condition. Approx. Retail:- $30,000