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2. Black Prince's Ruby - Wikipedia

   en.wikipedia.org/wiki/Black_Prince's_Ruby

   The gemstone at the front of the Imperial State Crown. The Black Prince's Ruby is a large, irregular cabochon red spinel weighing 170 carats (34 g) set in the cross pattée above the Cullinan II diamond at the front of the Imperial State Crown of the United Kingdom. [1]

3. Spinel - Wikipedia

   en.wikipedia.org/wiki/Spinel

   Polyhedral representation of spinel MgAl 2 O 4. Spinel (/ s p ɪ ˈ n ɛ l, ˈ s p ɪ n əl / [7]) is the magnesium/aluminium member of the larger spinel group of minerals. It has the formula MgAl 2 O 4 in the cubic crystal system. Its name comes from the Latin word spinella, a diminutive form of spine, in reference to its pointed crystals. [5]

4. Sterling silver - Wikipedia

   en.wikipedia.org/wiki/Sterling_silver

   Sterling silver is an alloy composed by weight of 92.5% silver and 7.5% other metals, usually copper. The sterling silver standard has a minimum millesimal fineness of 925. Tiffany & Co. pitcher ( c. 1871 ) having paneled sides and repoussé design with shells, scrolls and flowers; top edge is repousse arrowhead leaf design

5. Crown Jewels of the United Kingdom - Wikipedia

   en.wikipedia.org/wiki/Crown_Jewels_of_the_United...

   In the Imperial State Crown are Cullinan II (317 carats (63 g)), the Stuart Sapphire, St Edward's Sapphire, and the Black Prince's Ruby – a large red spinel. The Koh-i-Noor diamond (105 carats (21 g)) was acquired by Queen Victoria from the Sikh Empire and has featured on three consort crowns. A small number of disused objects at the Tower ...

6. Ring (jewellery) - Wikipedia

   en.wikipedia.org/wiki/Ring_(jewellery)

   Ruby ring. A ring is a round band, usually made of metal, worn as ornamental jewelry.The term "ring" by itself denotes jewellery worn on the finger; when worn as an ornament elsewhere, the body part is specified within the term, e.g., earrings, neck rings, arm rings, and toe rings.

7. List of jewellery types - Wikipedia

   en.wikipedia.org/wiki/List_of_jewellery_types

   Celibacy vow ring; Medical alert jewelry; Membership pin; Military dog tags; Pledge pins; Prayer jewelry Japa malas; Prayer beads; Prayer rope; Rosary beads; Puzzle jewelry. Puzzle ring; Signet ring; Thumb ring; Gemstone Jewelry