These modified cuts tend to have a crushed ice or needle like facet pattern, more similar to a radiant cut than a traditional cushion cut. The chart below serves as a general guideline for evaluating the cut of a cushion cut diamond.
Broadly speaking, two types of stem cell can be distinguished: embryonic stem (ES) cells which can only be derived from preâimplantation embryos and have a proven ability to form cells of all tissues of the adult organism (termed âpluripotentâ), and âadultâ stem cells, which are found in a variety of tissues in the fetus and after birth and are, under normal conditions, more specialized (âmultipotentâ) with an important function in tissue replacement and repair.
1 Fetal stem cells-These cells are taken from the germline tissues that will make up the gonads of aborted fetuses. 2  Umbilical cord stem cells-Umbilical cord blood contains stem cells similar to those found in bone marrow. Umbilical cord stem cells-Umbilical cord blood contains stem cells similar to those found in bone marrow. 2  Placenta derived stem cells-Up to ten times as many stem cells can be harvested from a placenta as from cord blood. 3  Adult stem cells-Many adult tissues contain stem cells that can be isolated.