The Yellow Sapphire
Yellow sapphires can range in color from greenish yellow to orangish-yellow and everything in between. The preferred yellow sapphire color is a medium, vibrant, canary yellow. These medium bright stones are still less expensive than a comparable blue or pink sapphire. Yellow sapphires are growing in value, they are a safe investment, and quite possibly the greatest you will find in a colored gemstone. Yellow sapphires are far more valuable if they have not been treated by high temperature heating. Yellow sapphires usually have feather type inclusions. If a yellow sapphire has been heated at a high temperature these feathers are destroyed and are easily identifiable by a trained gemologist. It is very unusual for natural untreated yellow sapphires to not have any internal feathers, making them so easy to identify.