While the weight of a diamond stud is important, it doesnt necessarily provide the "perceived size" of a diamond bracelet. A shallow cut diamond will have a greater diameter, and will therefore look larger.
diamond earrings in jewelry is the most popular of all gemstones. The price of it and rarity is carefully monitored by the major diamond cartels. As a result the price of diamond bracelet in jewelry is pretty well standardized to size and quality of the stone.
The tradition of giving princess cut diamond, as an engagement present was established in 1477 when the Archduke Maximillian of Austria gave a diamond ring to Maria of Burgundy.