White Diamond Brushed Yellow Gold Flexible Snake Necklace

Emerald

Probably the most expensive gemstone, the emerald is a member of the beryl family and can be valued higher than diamonds. Ranging in color from pure green to blue-green, the more vivid the tone, hue, and color consistency, the better the stone. Emeralds are the rare exception to the rule that inclusions are bad. In fact, gemologists use these flaws as evidence of the gem's authenticity. The gem's center should be as flawless as possible.

Emeralds rate a solid 7.5 to 8 on the Mohs Scale, making them an excellent choice for jewelry. As May's birthstone, the emerald is said to offer the wearer protection from evil spirits, provide the gift of eloquence and arouse both the intellect and the heart. Colombian emeralds are generally the most prized due to their transparency and fire.

Diamond

Diamonds are a form of the element carbon with a crystal structure. Diamond's great hardness relative to other materials has been known since antiquity, and is the source of its name derived from the ancient Greek ἀδάμας that means "unbreakable". 

Diamonds are the hardest natural substance on earth and rate a 10 on the Mohs Hardness Scale. Diamond is also known as April's birthstone. They are thought to be first recognized and mined in India many centuries ago.

Four characteristics, known informally as the "Four Cs", are now commonly used as the basic descriptors of diamonds: Carat, Clarity, Color and Cut.

This system was developed by GIA (Gemological Institute of America), one of the major gemological associations internationally recognized to evaluate diamond characteristics.

The carat weight measures the mass of a diamond and the clarity is a measure of internal defects of a diamond called inclusions. GIA’s D-to-Z diamond color-grading system measures the degree of colorlessness: the finest quality as per color grading is totally colorless, which is graded as D color diamond across the globe, meaning it is absolutely free from any color. Last, the cut of a diamond describes the quality of workmanship and the angles to which a diamond is cut.