1.90C, Premium, G, VS2 $13,860 only
If you have a budget below$15K, you can get a 1.90 carat Oval ring with Premium cut and Very Good Symmetry and Excellent symmetry.
Color and Clarity: The diamond is in Oval shape, and price much less than soliataire. As it release less brilliance than Soliataire, it is much safer to get a better color and clarity.  The major inclusion is at the side of stone, so it is not noticable with naked eye.
Shape: Due to the elongated shape, oval shape looks longer and larger than it is.  A 1.90 carat of soliataire diamond definitely cost more than $15k. …

0.97C, Ideal cut, G, VVS2, $4,510 only
If you have budget below $5 K and looking for 1carat diamond ring, i would recommend you for this 0.97 carat diamond ring. It is nearly colorless, not visible inclusions, excellent % of symmentry and polish, Ratio 1.00. It maximizes the return of brightness, suitable for those who emphasize on brilliance than size.

Price: $4,510
 
Description: 

Diamond Shape: Cushion
Diamond Carat: 0.97
Diamond Cut:  Ideal
Diamond Color: G
Diamond Clarity: VVS2

0.36C, Ideal, G, VVS2 $770 only *Sold out
For budget $1 K, you can get a 0.34 carat soliataire ring with Ideal cut and excellent polish and symmetry.
Price: $690
Description:
Diamond Shape: Solitaire
Diamond Carat: 0.36
Diamond Cut: Ideal
Diamond Color: G
Diamond Clarity: VVS2