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Refractive index readings of faceted gems can range around α = 1.651, β = 1.668, and γ = 1.689, with a biaxial positive birefringence of 0.037–0.038. With decreasing magnesium and increasing iron concentration, the specific gravity, color darkness and refractive indices increase, and the β index shifts toward the γ index.
Cutting and polishing diamonds in the Netherlands, 1946. The art of cutting a gem is an exacting procedure performed on a faceting machine.The ideal product of facet cutting is a gemstone that displays a pleasing balance of internal reflections of light known as brilliance, strong and colorful dispersion which is commonly referred to as "fire", and brightly colored flashes of reflected light ...
The crown height is related to the crown angle, the crown facet size, and the table size (the largest central facet of the crown): a happy medium is sought in a table that is not too small (resulting in larger crown facets and greater fire at the expense of brilliance) or too large (resulting in smaller crown facets and little to no fire).
A decorative glass crystal about 4 cm (1.6 in) in diameter, having a facet cut often applied for gemstones. At some positions, coloured light (see rainbow colouring) can be regarded caused by the intended optical prism effect of the cut.
It measures 4.54 cm × 4.08 cm × 2.42 cm (1.79 in × 1.61 in × 0.95 in). The diamond has a number of tiny flaws, scratches on the table facet, and a small chip at the girdle. Like Cullinan I, it is held in place by a yellow gold enclosure, which is screwed onto the crown. [37]
Patented design of top faceting of the trillion cut diamond (Patent No. D-250,100) A trilliant cut, sometimes called a trillion, trillian, or Trielle is a triangular type of gemstone cut. The cut has many variations. It may have curved or uncurved sides. The shape of the top surface, or table, also varies. Stones typically have 31-50 facets. [1]
Jewel Quest is a tile-matching puzzle video game created and published by iWin. First released for Windows , it has been redeveloped for Symbian S60 , the Nintendo DS (as Jewel Quest: Expeditions ), the Xbox 360's Xbox Live Arcade and other platforms. iWin also released a series of sequels and spin-off games.
Puzzle Quest 3 was developed by Infinity Plus 2 and published by 505 Games for release on Microsoft Windows and iOS and Android devices on March 1, 2022. [3] An early access form for Android was first released on March 26, 2021. [4] [5] Puzzle Quest 3 is a direct follow up of Puzzle Quest: Challenge of the Warlords. [6]