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2. Engagement ring - Wikipedia

   en.wikipedia.org/wiki/Engagement_ring

   In the United States, where engagement rings are worn by women, diamonds have been widely featured in engagement rings since the middle of the 20th century. [45] Solitaire rings have one diamond. The most common setting for engagement rings is the solitaire prong setting , which was popularized by Tiffany & Co. in 1886 and its six-claw prong ...

3. Diamond cut - Wikipedia

   en.wikipedia.org/wiki/Diamond_cut

   A diamond cut is a style or design guide used when shaping a diamond for polishing such as the brilliant cut. Cut refers to shape (pear, oval), and also the symmetry, proportioning and polish of a diamond. The cut of a diamond greatly affects a diamond's brilliance—a poorly-cut diamond is less luminous.

4. Sapphire - Wikipedia

   en.wikipedia.org/wiki/Sapphire

   Star sapphire 68 carat star sapphire in round mogul cut - men's ring version - 750 yellow gold - Russian goldsmith - handmade around 1990. A star sapphire is a type of sapphire that exhibits a star-like phenomenon known as asterism; red stones are known as "star rubies".

5. Halo headlights - Wikipedia

   en.wikipedia.org/wiki/Halo_headlights

   These rings are brighter and whiter than conventional halo rings that use incandescent bulbs. LED halo rings use bright light-emitting diodes. Because of a unique nature of LED lights that are made of layers of semiconductor material and can emit light of various colors depending on how these materials are chemically grouped, LED halo rings can ...

6. Halo (optical phenomenon) - Wikipedia

   en.wikipedia.org/wiki/Halo_(optical_phenomenon)

   A halo (from Ancient Greek ἅλως (hálōs) ' threshing floor, disk ') [1] is an optical phenomenon produced by light (typically from the Sun or Moon) interacting with ice crystals suspended in the atmosphere. Halos can have many forms, ranging from colored or white rings to arcs and spots in the sky.

7. 22° halo - Wikipedia

   en.wikipedia.org/wiki/22°_halo

   A 22° halo is an atmospheric optical phenomenon that consists of a halo with an apparent radius 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.