Vintage Jewelry Collection › Vintage Amythyst & Diamond Halo Ring Image 1 of 2 Image 2 of 2 Vintage Amythyst & Diamond Halo Ring $1,500.00 An 8mm x 5.5mm amethyst center stone surrounded by a delicate halo of 1.5mm diamonds, beautifully set in 14kt yellow gold. Add To Cart Added! An 8mm x 5.5mm amethyst center stone surrounded by a delicate halo of 1.5mm diamonds, beautifully set in 14kt yellow gold.