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2. Hierarchy of precious substances - Wikipedia

   en.wikipedia.org/wiki/Hierarchy_of_precious...

   Wedding anniversaries extend the jubilee hierarchy with various sequences of substances filling in many of the gaps between the same major milestones. In 2017 the 65th anniversary of the accession of Elizabeth II was widely referred to as her "sapphire jubilee" or more specifically as her blue sapphire jubilee (see Sapphire Jubilee of Queen Elizabeth II) [1] but more traditionally the sapphire ...

3. Colored gold - Wikipedia

   en.wikipedia.org/wiki/Colored_gold

   Although the names are often used interchangeably, the difference between red, rose, and pink gold is the copper content: the higher the copper content, the stronger the red coloration. Pink gold uses the least copper, followed by rose gold, with red gold having the highest copper content. Examples of the common alloys for 18K rose gold, 18K ...

4. List of sapphires by size - Wikipedia

   en.wikipedia.org/wiki/List_of_sapphires_by_size

   Blue-violet National Museum of Natural History, Washington [9] Star of Bombay: Sri Lanka 182 carats (36.4 g) Star Blue-violet National Museum of Natural History, Washington [10] Ruspoli Sapphire: 136.9 carats (27.38 g) [11] Stuart Sapphire: Sri Lanka 104 carats (20.8 g) Blue Tower of London [12] Bismarck Sapphire: Myanmar: 98.56 carats (19.712 ...

5. Kundan - Wikipedia

   en.wikipedia.org/wiki/Kundan

   Kundan, meaning pure gold, [1] is a traditional form of Indian gemstone jewellery involving a gem set with a gold foil between the stones and its mount, usually for elaborate necklaces and other jewellery. [2] [3]

6. Lapis lazuli - Wikipedia

   en.wikipedia.org/wiki/Lapis_Lazuli

   Lapis lazuli (UK: / ˌ l æ p ɪ s ˈ l æ z (j) ʊ l i, ˈ l æ ʒ ʊ-,-ˌ l i /; US: / ˈ l æ z (j) ə l i, ˈ l æ ʒ ə-,-ˌ l i /), or lapis for short, is a deep-blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color.

7. Jewels of Mary, Queen of Scots - Wikipedia

   en.wikipedia.org/wiki/Jewels_of_Mary,_Queen_of_Scots

   A small sapphire set a jour was prized as remedy for sore eyes, "ung petit saffiz a jour pour frotter les yeux". This sapphire was pierced to wear as a pendant and set with two gold leaves. [31] According to Hildegard of Bingen, a sapphire used as remedy for conjunctivitis was placed in the mouth and then a dab of saliva would be rubbed in the ...