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2. Diamond - Wikipedia

   en.wikipedia.org/wiki/Diamond

   Diamonds can be sold already set in jewelry, or sold unset ("loose"). According to the Rio Tinto, in 2002 the diamonds produced and released to the market were valued at US$9 billion as rough diamonds, US$14 billion after being cut and polished, US$28 billion in wholesale diamond jewelry, and US$57 billion in retail sales. [110]

3. Thiolate-protected gold cluster - Wikipedia

   en.wikipedia.org/.../Thiolate-protected_gold_cluster

   Top left: full structure; middle : only gold core and Au-S shell displayed, bottom right: only Au 13-core displayed. Thiolate-protected gold clusters are a type of ligand-protected metal cluster, synthesized from gold ions and thin layer compounds that play a special role in cluster physics because of their unique stability and electronic ...

4. Engagement ring - Wikipedia

   en.wikipedia.org/wiki/Engagement_ring

   Rings with a larger diamond set in the middle and smaller diamonds on the side fit under this category. Three-stone diamond engagement rings, sometimes called trinity rings or trilogy rings, are rings with three matching diamonds set horizontally in a row with the bigger stone placed in the center. The three diamonds on the ring are typically ...

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6. Gold-filled jewelry - Wikipedia

   en.wikipedia.org/wiki/Gold-filled_jewelry

   Gold-filled material is used to create a variety of products, including: Jewelry: Gold-filled is a popular choice for jewelry because it's durable, affordable, and hypoallergenic. Findings and components: Gold-filled is also used to make jewelry findings (e.g., clasps, jump rings) and other components.

7. Sapphire - Wikipedia

   en.wikipedia.org/wiki/Sapphire

   In October 2014, Sotheby's Hong Kong achieved consecutive per-carat price records for Kashmir sapphires – first with the 12.00 carat Cartier sapphire ring at US$193,975 per carat, then with a 17.16 carat sapphire at US$236,404, and again in June 2015 when the per-carat auction record was set at US$240,205. [39]