Extremely subtle color differences can be very important to determine rarity of a fancy diamonds, but are never a critical factor in beauty.
Clean your diamond stud regularly using either commercial jewellery cleaner or a solution of one part ammonia and six parts water. Dip the jewellery into the solution and use a soft brush to loosen any dirt that has accumulated under the setting. This will greatly increase the brilliance of your diamond dealers.
The diamonds shoppers paradise has moved from Amsterdam to Antwerp ( Belgium ) after World War II. Nowadays Amsterdam is known for its tulips and canals.