Consider grading the gemstone on its colours. If U-V yellow grade is visible, the yellow diamond is likely to be low grade. They get gradually more vibrant all the way up to a rating of “Elegant Stunning Yellow”.
Choose the cut of the loose yellow-coloured gemstones you want to buy. The "cut" can be ranked "poor" all the way to "ideal." The better the cut, the more expensive the precious rock and the more elegance and glimmer the gemstones will have.
Select the loads of the carats. The largest you can select is about 10.00, while the tiniest is about 0.25. Don't mix up "points” and “carats". One size is equal to 100 factors.
Pick the quality you want each loose yellow-coloured precious rock to have. The quality relates to the flaws there might be in a particular yellow diamond. A perfect precious rock, which has a quality of "FL," contains no blemishes, but these rocks are very hard to find. Stones that have minimal blemishes are evaluated as "VVS1" or "VVS2." Yellowish gemstones that have faults you can see without magnifying are evaluated "I1", "I2" and "I3” or "SI1", "SI2".
Select the form of the yellow-coloured gemstones you are looking to buy. Common precious rock forms include: circular, asscher, princess, oval, triangular, centre, pear, square, marquise, queen, support, rub, head and radiant.