Wholesale loose stones for jewelry making and investment purposes are available. Four stones are precious stones: diamond, emerald, ruby, and sapphire. Everything else falls under the category of semi-precious stones. All of the stones come with a certificate. Diamonds grading system based on the concept of the four C’s: color, cut, carat, and clarity. Clarity is determined by placing the diamond under 10X magnification. With the proper cut, the diamond will sparkle. Clarity and color are next in importance. All other gemstones grade with the naked eye. The quality of all wholesale colored stones based on the clarity and brilliance of the stone’s color, which divided into three parts: hue, saturation, and tone. Hue refers to the stone’s color, which produced in the following spectral hues: red, orange, yellow, green, blue, violet, purple and pink. Purple and pink are spectral hues, as purple lies halfway between red and blue, and pink is really a lighter shade of red. Natural stones seldom have pure hues, so these are into primary, secondary, and sometimes tertiary hues. Saturation refers to the clarity of color, or the stone’s freedom from brown or grey hues.