Lapis Lazuli

  As a general rule, solid blue lapis or solid blue with a few grains of gold pyrite are the most desirable colors. In the photo above the bottom two cabochons approach that ideal. The large cabochon on the top right has a few thin veins of calcite and some calcite mottling. This stone is attractive and some people might prefer it, but the calcite reduces its desirability for most people. The top left cabochon has large patches of calcite that are intergrown with blue lazurite to yield a faded denim color. It also contains many visible grains of pyrite. For most people, it would be the least desirable stone in the photo; however, some people will enjoy it. Desirability in lapis varies from stone to stone and from person to person

 

Glossary of Jewelry Terms

KT: (Karat) refers to the fineness of gold: one karat is equal to 1/24th part of pure gold in an alloy.

18KTY: 18 Karat Yellow Gold
18KTW: 18 Karat White Gold
18KTR: 18 Karat Rose Gold
14KTY: 14 Karat Yellow Gold
14KTW: 14 Karat White Gold

14KTR: 14 Karat Rose Gold

CT: (Carat)  

CTW: (Total Carat Weight) The term refers to the sum of the weights of all diamonds mounted in a piece of jewelry.

SHANK: refers to the band of the ring or the part that actually encircles your finger. Most shanks are round, but there are also square shaped-shanks and other more creative shapes.

GIA : Gemological Institute of America; known as the leading authority for gemology internationally.

GIA Color Grading Scale: The GIA scale begins with the letter D, representing colorlessness, and continues with increasing presence of color to the letter Z, representing light yellow, light brown or light gray. The 23 color grades on the GIA Color Scale (or diamond color chart) are subdivided into five subcategories, which are: colorless (D-F); near colorless (G-J); faint (K-M); very light (N-R); and light (S-Z).

GIA Diamond Clarity Scale: The GIA Diamond Clarity Scale has 6 categories, some of which are divided, for a total of 11 specific grades.

 

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