Various shades of purple, from red to brown. Since amethysts are not especially rare, they tend to be very affordable.
Various shades of green from yellow to blue. This is a gem of royalty. Emeralds can cost as much as, if not more than, many diamonds.
Old-fashioned stones ranging from yellow-orange to brown to true red to purple. These are not so rare and are another affordable stone.
A precious stone that ranges in color from blue to orange to true red.
Various shades of blue, from light to true to green. A traditional side stone on many diamond rings.
The look: Various hues, including pink, blue, yellow, orange, and brown. Best for: A cocktail ring at your bachelorette party.