Average retail prices dec 2020. This means that good quality sapphires and rubies in larger sizes tend to have a much higher price per carat. 1 characteristics 1 1 value 2 uses 3 list of gemstones 3 1 agni mani 3 2 alamandine 3 3 alestone 3 4 alexandrite 3 5 algae 3 6 amaratha 3 7 amber 3 8 amethyst 3 9 andar 3 10 aquamarine.