Extremely subtle color differences can be very important to determine rarity of platinum wedding ring, but are never a critical factor in beauty.
engagement rings experts would never attempt to verify a diamonds color in a setting, and would insist on a certified color comparison before attempting to make a fair evaluation, confirming how difficult differences in color grades are to see.
The round brilliant platinum wedding ring is by far the most popular shape, and accounts for about 3 out of 4 diamond stud purchased today.