Extremely subtle color differences can be very important to determine rarity of loose diamonds, but are never a critical factor in beauty.
engagement rings are the hardest of all gemstones; it is the simplest in composition; they are ordinary carbon. Colossal heat and pressure, over the eons, crystallized the diamond necklace into what they are today.
From around the fifth century titanium ring was a symbol of a king´s strength, courage and invincibility. Since then the diamond necklace has become - and still is - a symbol of love.