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.
Implantation will usually occur somewhere between 6 and 12 days past ovulation. Once the fertilized egg implants, the developing placenta begins releasing hCG (human chorionic gonadotropin) into the blood. Some hCG also gets passed into the urine. hCG levels usually double every 2-3 days in early pregnancy. Once the levels are high enough they can then be picked up by a home pregnancy test. Depending on the pregnancy test brand and when implantation occurs for you this will range from 10-16 days after conception has occurred. Pregnancy test sensitivity will be your next consideration. The sensitivity of home pregnancy tests vary quite widely from brand to brand - anywhere from 10 mIU to 250 mIU.