What anchors us . . .
When it gets a little confusing . . .
GIA’s colour-grading scale for diamonds is the industry standard. The scale begins with the letter D, representing colorless, and continues with increasing presence of colour to the letter Z, or light yellow or brown. Each letter grade has a clearly defined range of colour appearance.
SI Clarity Diamonds. Diamond grading helps standardize and set the value and price of all diamonds. … A diamond’s sparkle is represented by its graded components such as clarity. Clarity is graded face up under 10x magnification with a tool called a loupe or diamond microscope.
Tanzanite is one of the best-selling coloured stones in today’s gem and jewellery markets. … At the same time, tanzanite is a rare gem. All of the known deposits are confined to a few square kilometres of land in northern Tanzania. It is the only gemstone with a large and growing popularity that has such a limited known supply.