The core promoter region is located most proximally and contains the RNA polymerase binding site, TATA box, and transcription start site (TSS). RNA polymerase will bind to this core promoter region stably and transcription of the template strand can initiate. The TATA box is a DNA sequence (5'-TATAAA-3) within the core promoter region where general transcription factor proteins and histones can bind.
The color palette of diamond is very richly varied; it ranges from pink through red, blue, green, yellow and brown even to black diamonds. The rarest color occurring in natural diamonds is red, followed by green, blue, purple and brown.
Unlike diamonds, color gemstones do not have a perfect grading system. Hence, we along with a lot of the leading jewelers grade our Emeralds as Natural AAA, Natural AA or Natural A.Natural AAA (Best). Natural AAA gemstones are the top 10% of gemstones in terms of quality.They are rich green, moderately to slightly included and exhibits high brilliance.atural A (Good). Natural A gemstones are the top 50%-75% of gemstones in terms of quality. They are Dark green, opaque and heavily included. They are comparable to that used by mall jewelers or small family jewelry shops.