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2. Prong setting - Wikipedia

   en.wikipedia.org/wiki/Prong_setting

   A prong set diamond in a gold ring.. Prong setting or prong mount refers to the use of metal projections or tines, called "prongs", to secure a gemstone to a piece of jewelry.A prong setting is one component of what is known to jewelers as a head, a claw-shaped type of binding (typically three, four, or six individual prongs per head) that is welded or soldered to a jewelry item to mount (or ...

3. Engagement ring - Wikipedia

   en.wikipedia.org/wiki/Engagement_ring

   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 setting design sold under the "Tiffany setting" trademark. The modern favorite cut for an engagement ring is the brilliant cut, which provides the maximum amount of sparkle to the gemstone. [46]

4. Diamond cut - Wikipedia

   en.wikipedia.org/wiki/Diamond_cut

   Oval-shaped diamonds were introduced by Lazare Kaplan in the 1960s. Usually noted to have 56 facets, the weight of such diamonds is estimated by measuring the length and width of the stone. A ratio of 1.33 to 1.66 provides a good traditional range of oval-shaped diamonds.

5. Eternity ring - Wikipedia

   en.wikipedia.org/wiki/Eternity_ring

   The concept of a diamond eternity ring was created in the 1960s by diamond merchant De Beers. [5] [6] American investigative journalist Edward Jay Epstein stated that at the time the company had a secret agreement with the Soviet Union which, in return for the creation of a "single channel" controlling the world's supply of diamonds, required the purchase of 90–95% of the uncut gem diamonds ...

6. Koh-i-Noor - Wikipedia

   en.wikipedia.org/wiki/Koh-i-Noor

   The stone now measures 3.6 cm (1.4 in) long, 3.2 cm (1.3 in) wide, and 1.3 cm (0.5 in) deep. [62] Brilliant-cut diamonds usually have 58 facets, but the Koh-i-Noor has 8 additional "star" facets around the culet , making a total of 66 facets.

7. 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.