Size
Contrary to popular belief the carat weight of a gemstone is not necessarily an accurate gauge for gemstone size. To help you judge the size of a gemstone, Liali lists the diameter of the gemstone when viewed from the top - since that is the only part of the gemstone that is visible when the gemstone is set in jewellery.
Color
There are three main parameters that the jewelry industry uses to grade a gemstone: by purity of its hue, the depth of tone, and its color saturation. The best value is in colors that include "slight" traces of other colors, are not too dark or too light, and have a lot of saturated color. Liali offers some of the highest-quality colored gemstones available in the market. Nearly all gemstones today, including Liali stones, have been treated to enhance their color. The most common methods of treatment are heating (nearly always seen with aquamarine, citrine, amethyst, sapphire, ruby and tanzanite), bleaching (commonly seen with pearls), and irradiation (performed on nearly all blue topaz).

Clarity
Almost all gemstones contain inclusions. Even those highly prized pieces that are almost perfect have at least some inclusions. Absolute clarity is a rarity in gemstones as it is natural. They are far and few, in fact almost impossible to find. Thus the flawless ones are invaluable and extremely expensive. The best value is found in gems that are lightly to moderately ‘included’ like those in Liali’s gemstone jewelry. Emeralds are typically treated with colorless oil, wax or resin to minimize surface-reaching inclusions.
Cut
Gemstones are cut in a unique way. Unlike diamonds, with gemstones there isn't an "ideal" cut geometrically configured for maximum brilliance. But a high-quality gemstone cut, is one that presents the most even color, exposes the fewest inclusions, and displays highest gemstone weight when set in jewelry