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Crushed stone comes in several grades, and some of the most popular grades are #5, #67, #1, #8, #3, #10, #57 and #411. Crushed stone is used primarily in construction, while homeowners commonly use grade #57 for driveway... More »

The most common size is grade 5 crushed stone, which contains pieces of stone that are typically no larger than 1 inch. Crushed stone grades 57 and 67 are also commonly used for driveways and construction and contain pie... More »

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Lapis lazuli means blue stone. Lapis is the Latin word for stone, and azula comes from the Arabic language and means blue. Lapis lazuli is the stone of friendship and truth. The deep blue gemstone encourages peaceful rel... More »

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Look for reflections of blue and red within a ruby, as well as uniform color and small inclusions, or flaws, within the body of the stone. Bubbles, scratches and a stone that is too clear and perfect are indications that... More »

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You can tell whether a diamond is real or fake by looking at certain details of the diamond, such as presence of imperfections, the shape of the edges and the stone’s refractivity. Other tests include the "fog test" and ... More »

Individual diamond prices vary and depend on the characteristics of each stone. Established in the 1940s, the grading system currently in use weighs each stone's color, clarity, cut and carat weight in determining its pr... More »