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2. Marshal's star - Wikipedia

   en.wikipedia.org/wiki/Marshal's_star

   It is a gold five-pointed star with smooth diagonal rays on the front side. In the center is a platinum, five-pointed star with diamonds. The diamonds in the center have a total weight of 2.62 carats and in the rays there are 25 diamonds weighing a total of 1.25 carats. Between the edges of rays are 5 diamonds weighing a total of 3.06 carats.

3. Carat (mass) - Wikipedia

   en.wikipedia.org/wiki/Carat_(mass)

   The carat (ct) is a unit of mass equal to 200 mg (0.00705 oz; 0.00643 ozt), which is used for measuring gemstones and pearls. The current definition, sometimes known as the metric carat , was adopted in 1907 at the Fourth General Conference on Weights and Measures , [ 1 ] [ 2 ] and soon afterwards in many countries around the world.

4. Grain (unit) - Wikipedia

   en.wikipedia.org/wiki/Grain_(unit)

   For pearls and diamonds, weight is quoted in carats, divided into four grains. The carat was eventually set to 205 milligrams (1877), and later 200 milligrams. For touch or fineness of gold, the fraction of gold was given as a weight, the total being a solidus of 24 carats or 96 grains.

5. Brilliant (diamond cut) - Wikipedia

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

   Diamond proportions and facets, for the round brilliant cut. The original 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.

6. Tiffany & Co. flagship store - Wikipedia

   en.wikipedia.org/wiki/Tiffany_&_Co._flagship_store

   [9] [11]: 441 [24] The salesroom's most prominent permanent display is the Tiffany Yellow Diamond, a 128.54-carat gem. [25] [15] Metalwork such as brass, copper, silver, and stainless steel is used throughout the interior. [25] The upper floors were built with public and private showrooms.

7. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   A diamond core drill bit is intended to cut an annular hole in the workpiece. Large bits of similar shape are used for geological work, where a deep hole is drilled in sediment or ice and the drill bit, which now contains an intact core of the material drilled with a diameter of several centimeters, is retrieved to allow study of the strata .