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2. Marie Antoinette Diamond Earrings - Wikipedia

   en.wikipedia.org/wiki/Marie_Antoinette_Diamond...

   The earliest attested version of the earrings was purchased by Marjorie Merriweather Post from Pierre C. Cartier in 1928. At this point, they comprised a pair of pear-shaped diamond drops—20.34 and 14.25 carats in weight respectively—sourced from either India or Brazil. [1] The diamonds were installed in silver settings with gold links.

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. 22° halo - Wikipedia

   en.wikipedia.org/wiki/22°_halo

   22° halo around the Sun 22° halo around the Moon. A 22° halo is an atmospheric optical phenomenon that consists of a halo with an apparent diameter of approximately 22° around the Sun or Moon. Around the Sun, it may also be called a sun halo. [1] Around the Moon, it is also known as a moon ring, storm ring, or winter halo.