The ring is fashioned from 18-carat white gold and features a 6mm cushion surrounded by 15 round brilliant-cut diamonds. It is available with a variety of different coloured centre stones and can also be worked in yellow gold.Featuring Bolton Gems' Eternity diamonds, these radiance cut diamond stud earrings (below) are available in 18-carat yellow and white gold. Total diamond weight can be from 0.10-carat to 1-carat.