The stage is based on: 1  The prostate biopsy results (including the Gleason score) 2  The blood PSA level at the time of diagnosis. 3  The results of any other exams or tests that were done to find out how far the cancer has spread.
Like all commodities even gemstones are graded.The quality and cost of a gemstone completely depend on its cut. Grading the quality of gemstones: Alpha grading is a commonly heard term in conjunction to grading of gemstones.This grading is based on several qualities such as colour, cut and clarity.AA quality gemstones are the most sought out precious stones, for the cut is perfect and the colour is vibrant. AAA gemstones are a lot more affordable than super fine stones and are generally used in making jewellery. a5555597-894e-414c-8244-6627393966a9|0|.0|27604f05-86ad-47ef-9e05-950bb762570c.
Are all gems minerals? A mineral is an inorganic, naturally occurring substance with distinct chemistry and crystalline structure. Gemstones are materials that have an economic or aesthetic value. Therefore, not all gemstones are minerals. For example, amber is solidified tree resin, so it is not a mineral. Gemstones can be classified as either amorphous or crystalline. Amorphous gemstones have no orderly internal atomic structure and no naturally occurring shape. Glass, amber, and opal are examples. Crystalline gemstones are minerals; they have a definite and regular internal atomic structure. Examples include garnet, emerald, and ruby. PROCEDURE: Most students are familiar with their birth month's gemstone. Poll your students and see if you can list the months and the gems just from their answers.