Natural Burmese Ruby and Diamond Halo Ring

Vintage 1970s halo ring in 18k gold. It is set in its center with a natural Burmese ruby of approximately 2.14 carats, surrounded by 12 round diamonds totaling approximately 0.5 carats, and 4 natural Burmese rubies for a total of approximately 0.80 carats.
 NB: A gemological report from the Bellerophon Institute was carried out, indicating heated ruby with minor residue.
 Detailed characteristics
 Weight: 5.2 g
 Size: 53 FR (6.5 US - M 1/2 UK)
 Metal: 18 carat gold
 Stones: Burmese Diamonds and Rubies
 Weight of Burmese Rubies:
 Central: approx. 2.14 carats
 Surround: approx. 0.8 carat
 Diamond Weight: approx. 0.5 carat
 Diamond Quality: Estimated VS
 Diamond Color: Estimated D/E
 Guarantee hallmark: eagle's head (18 carat gold)
 Master's mark: illegible
 Plate: 17 x 14 mm
 NB: A gemological report from the Bellerophon Institute was carried out, indicating heated ruby with minor residue.