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2. List of sapphires by size - Wikipedia

   en.wikipedia.org/wiki/List_of_sapphires_by_size

   "The Grand Sapphire of Louis XIV and The Ruspoli Sapphire". Gems & Gemology. 51 (4). Gemological Institute of America. ISSN 0016-626X; Gemological Institute of America (2019). "sapphire". Gemological Institute of America; Howard, Bill (December 2, 2011). "The rush job from Hell". Southern Jewelry News

3. Colored gold - Wikipedia

   en.wikipedia.org/wiki/Colored_gold

   White gold is an alloy of gold and at least one white metal (usually nickel, silver, platinum or palladium). [5] Like yellow gold, the purity of white gold is given in karats. White gold's properties vary depending on the metals used and their proportions. A common white gold formulation consists of 90% wt. gold and 10% wt. nickel. [4]

4. Marcasite jewellery - Wikipedia

   en.wikipedia.org/wiki/Marcasite_jewellery

   Marcasite jewellery is jewellery made using cut and polished pieces of pyrite (fool's gold) as gemstone, and not, as the name suggests, from marcasite. [1] Both pyrite and marcasite are chemically iron sulfide, but differ in their crystal structures, giving them different physical properties. Pyrite is more stable and less brittle than marcasite.

5. 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".

6. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Spanish emerald and gold pendant at Victoria and Albert Museum Enamelled gold, amethyst, and pearl pendant, about 1880, Pasquale Novissimo (1844–1914), V&A Museum number M.36-1928. Gemstones have no universally accepted grading system. Diamonds are graded using a system developed by the Gemological Institute of America (GIA) in the early ...

7. Cardinal gem - Wikipedia

   en.wikipedia.org/wiki/Cardinal_gem

   The five cardinal gems. Clockwise from top: sapphire, ruby, emerald, amethyst, diamond. Cardinal gems are gemstones which have traditionally been considered precious above all others. The classification of the cardinal gems dates back to antiquity, and was largely determined by ceremonial or religious use as well as rarity. [1]