enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Gems of Sri Lanka - Wikipedia

   en.wikipedia.org/wiki/Gems_of_Sri_Lanka

   Sri Lanka, geologically speaking is an extremely old country. Ninety percent of the rocks of the island are of Precambrian age, 560 million to 2,400 million years ago. The gems form in sedimentary residual gem deposits, eluvial deposits, metamorphic deposits, skarn and calcium-rich rocks. Nearly all the gem formations in Sri Lanka are located ...

3. Sapphire - Wikipedia

   en.wikipedia.org/wiki/Sapphire

   Sri Lanka 392.52 carats Cushion Blue Anonymous owner Logan Sapphire [82] Sri Lanka 422.99 carats Cushion Blue National Museum of Natural History, Washington Queen Marie of Romania [83] Sri Lanka 478.68 carats Cushion Blue Anonymous owner Star of Adam [17] Sri Lanka, 2015 1404.49 carats Star Blue Anonymous owner Star of Bombay: Sri Lanka 182 ...

4. Gemological Institute of America - Wikipedia

   en.wikipedia.org/wiki/Gemological_Institute_of...

   The Gemological Institute of America (GIA) is a nonprofit institute based in Carlsbad, California. It is dedicated to research and education in the field of gemology and the jewelry arts. [ 1 ] Founded in 1931, GIA's mission is to protect buyers and sellers of gemstones by setting and maintaining the standards used to evaluate gemstone quality.

5. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Gemological Institute of America (GIA), the main provider of education services and diamond grading reports International Gemological Institute (IGI), independent laboratory for grading and evaluation of diamonds, jewelry, and colored stones

6. Black Star sapphire - Wikipedia

   en.wikipedia.org/wiki/Black_Star_sapphire

   Black star sapphire is found in Thailand, Cambodia, Tanzania, Australia, Sri Lanka, Sierra Leone, Laos and many other countries, although supply is growing continuously exhausted, and mine yields have decreased. [2] The mines on the Thai/Cambodia border were reported to be almost exhausted of clear high-value gems by the late 1990s.

7. Diamond (gemstone) - Wikipedia

   en.wikipedia.org/wiki/Diamond_(gemstone)

   Gemological Institute of America (GIA) was the first laboratory in America to issue modern diamond reports, [32] and is held in high regard amongst gemologists for its consistent, conservative grading. Diamond High Council (HRD) Official certification laboratory of the Belgian diamond industry, located in Antwerp. [33]

8. Category:Gemology - Wikipedia

   en.wikipedia.org/wiki/Category:Gemology

   Pages in category "Gemology" The following 32 pages are in this category, out of 32 total. ... Gems & Gemology; Gems of Sri Lanka; Gemstone industry in Greenland;

9. Diamond simulant - Wikipedia

   en.wikipedia.org/wiki/Diamond_simulant

   Diamond simulants and their gemological properties; Material Formula Refractive index(es) 589.3 nm Dispersion 431–687 nm Hardness (Mohs' scale) Density (g/cm 3) Thermal condc. State of the art Diamond: C: 2.417 0.044 10 3.52 Excellent Artificial simulants Flint glass: Silica with Pb, Al, Tl ~ 1.6 > 0.020 < 6 2.4–4.2 Poor 1700– White ...