Creatinine is a normal waste product produced by muscle metabolism. When your kidneys are functioning normally, they filter creatinine and other waste products out of your blood and send them out of the body through urine. A creatinine urine test measures the amount of creatinine in your urine and can help your doctor evaluate how well your kidneys filter waste. This is useful in diagnosing or ruling out kidney diseases and some other conditions.
These terms are based on old traditions from the west. These days, all gemstones are considered precious since they are all rare and there is a limited supply of them. The traditional list of gemstones that are considered precious stones are: Diamond.
That's why lab-created gemstones are available as alternatives. The more expensive and hard-to-find natural gems in jewelry, such as diamond (white and fancy color), sapphire (blue and other colors), emerald, ruby and opal, are favorite lab-created stones. They're not gem imitations; lab-created gemstones are the real deal.