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2. Brilliant (diamond cut) - Wikipedia

   en.wikipedia.org/wiki/Brilliant_(diamond_cut)

   Diamond proportions and facets, for the round brilliant cut. The modern round brilliant-cut was developed by Marcel Tolkowsky in 1919. The ideal proportions are 100% diameter, 53% table, 43.1% pavilion and 16.2% crown. The girdle and culet (if any—not part of Tolkowsky's original design) are cut from the ideal brilliant.

3. Diamond cut - Wikipedia

   en.wikipedia.org/wiki/Diamond_cut

   The most popular of diamond cuts is the modern round brilliant, whose 57 facets arrangements and proportions have been perfected by both mathematical and empirical analysis. Also popular are the fancy cuts, which come in a variety of shapes, many of which were derived from the round brilliant. A diamond's cut is evaluated by trained graders ...

4. Marcel Tolkowsky - Wikipedia

   en.wikipedia.org/wiki/Marcel_Tolkowsky

   Marcel Tolkowsky found that if a diamond was cut too deep or shallow then light would escape out the sides or bottom of the diamond, resulting in a loss of brilliance (white light reflected up through the top of a diamond), fire (colored light reflected from within a diamond), and sparkle (combination of fire and brilliance). [4]

5. Diamond (gemstone) - Wikipedia

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

   The process of diamonds being used for drilling ornamental beads dates back to 2nd millennium BC. Archaeologists working in Yemen have excavated beads with evidences of diamond drilling from 1200 BC to 1st century AD from the site of Hajar ar Rayhani, with double diamond drilling from 1000 to 600 BC.

6. AOL Style & Fashion News, Tips, Deals and More - AOL.com

   www.aol.com/style

   AOL Editors curate the Style section to bring you the latest in celebrity fashion, latest style tips, and beauty deals.

7. Tondo (art) - Wikipedia

   en.wikipedia.org/wiki/Tondo_(art)

   According to art historian Roberta Olson, Michelangelo's "only documented and securely attributed panel painting" was a tondo -- the Doni Tondo at the Uffizi. [4] Michelangelo also created, at the time he was sculpting his David , two carved marble tondi -- the Taddei Tondo and the Pitti Tondo .