Solitaire 18-karat white gold diamond ring Maison Margiela Fine Jewelry, Part of its 'Heritage' collection, Maison Margiela Fine Jewelry's 18-karat white gold 'Solitaire' ring features bisected white diamonds that symbolize the many facets of modern union. This timeless piece will make a thoughtful gift Size: 52. Gender: Female. Age Group: Adult.