gemstones
21Gemology — (gemmology outside the United States) is the science, art and profession of identifying and evaluating gemstones. It is considered a geoscience and a branch of mineralogy. Some jewelers are academically trained gemologists and are qualified to… …
22Diamond (gemstone) — Part of a series on Diamonds Material Material properties Crystallographic defects Formatio …
23Business and Industry Review — ▪ 1999 Introduction Overview Annual Average Rates of Growth of Manufacturing Output, 1980 97, Table Pattern of Output, 1994 97, Table Index Numbers of Production, Employment, and Productivity in Manufacturing Industries, Table (For Annual… …
24Chrysoberyl — General Category Oxide minerals Spinel group Chemical formula Be …
25Turquoise — For other uses, see Turquoise (disambiguation). Turquoise Turquoise (tumble finished) one inch (25 mm) long. This pebble is greenish and therefore low grade General …
26Ratnagarbhas — ( Sanskrit word) are precious gemstones (crystalline minerals or petrified material). Mother earth is the real source of all the gems that people use hence it is called “Ratnagarbhas” (mother of all the jewels). [1 DIVINE GEMS AND JEWELS, Gems… …
27Tourmaline — Schorl Tourmaline General Category Cyclosilicate Chemical formula (Ca,K,Na,[ …
28Facet — Facets are flat faces on geometric shapes. The organization of naturally occurring facets was key to early developments in crystallography, since they reflect the underlying symmetry of the crystal structure. Gemstones commonly have facets cut… …
29French Crown Jewels — Crown Jewels of France, on display at the Louvre with the crown and diadem of Empress Eugenie to the left, the set of Queen Marie Amélie in the centre and the crown of Louis XV to the right with the diadem of the Duchess of Angoulème …
30Diamond simulant — Due to its low cost and close visual likeness to diamond, cubic zirconia has remained the most gemologically and economically important diamond simulant since 1976. The high price of gem grade diamonds, as well as significant ethical concerns of… …
