Extremely subtle color differences can be very important to determine rarity of a diamond rings, but are never a critical factor in beauty.
From around the fifth century antique engagement ring were a symbol of a king´s strength, courage and invincibility. Since then the engagement ring have become - and still are - a symbol of love.
Remember, all diamonds are not created equal. Two diamonds of equal Carat Weight may vary substantially in price due to their Cut, Colour and Clarity. The carat weight of a wedding bands is a very important determining factor in its value.