Peridot belongs to the forsterite-fayalite mineral series which is part of the olivine group. It is one of the idiochromatic gems, meaning its color comes from the basic chemical composition of the mineral itself, not from minor impurities, and therefore will only be found in shades of green. In fact peridot is one of the few semi-precious gemstones found in only one color.
They have highly sensitive blood tests that can detect the pregnancy hormone (hCG) a few days earlier around day 3 to 4 after implantation. Again, some women have had positive urine tests as early as 2 to 3 days after implantation and others have had to wait up to a few weeks.
Both test for hCG levels; the only difference lies in that the former tests its levels within the blood stream while the later in the urine. A positive blood test will usually show a positive result 3 to 4 days after implantation, or roughly 9 to 10 days after ovulation.For a home urine test, however, a positive result will not be visible until a week after implantation or until you have a missed period.t went from a red color & 4 days to a brown & 2 1/2 days. 2 months ago same thing so I took a test it was negative. Then when I woke up next morning that same test showed a positive result. Last month my period was a week early brown in color & only 1 1/2 days long. Took another test same thing happened again.