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2. Hierarchy of precious substances - Wikipedia

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

   The measurement of sales of popular music starts high relative to the wedding anniversary scale, concentrating on gold and platinum (see gold album).Likewise, credit card companies usually have a "gold card" and a "platinum card" (many formerly had a "silver card" then followed by a "gold card", but due to similarity in appearance between silver and platinum these were often discontinued with ...

3. Wedding ring - Wikipedia

   en.wikipedia.org/wiki/Wedding_ring

   A wedding ring is commonly worn on the ring finger. A pair of wedding rings. A wedding ring or wedding band is a finger ring that indicates that its wearer is married. [1] It is usually forged from metal, traditionally gold or another precious metal. Rings were used in ancient Rome during marriage. [2]

4. Engagement ring - Wikipedia

   en.wikipedia.org/wiki/Engagement_ring

   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 said to represent the couple's past, present, and future, but other people give religious significance to ...

5. Platinum - Wikipedia

   en.wikipedia.org/wiki/Platinum

   Platinum is a chemical element; it has symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Its name originates from Spanish platina, a diminutive of plata "silver". [7] [8] Platinum is a member of the platinum group of elements and group 10 of the periodic table of ...

6. Tungsten - Wikipedia

   en.wikipedia.org/wiki/Tungsten

   Tungsten(IV) chloride, WCl 4, a black solid, which adopts a polymeric structure. Tungsten(V) chloride WCl 5, a black solid which adopts a dimeric structure. Tungsten(VI) chloride WCl 6, which contrasts with the instability of MoCl 6. Organotungsten compounds are numerous and also span a range of oxidation states.

7. Platinum–iridium alloy - Wikipedia

   en.wikipedia.org/wiki/Platinum–iridium_alloy

   Platinum–iridium alloys are alloys of the platinum group precious metals platinum and iridium. Typical alloy proportions are 90:10 or 70:30 (Pt:Ir). These have the chemical stability of platinum, but increased hardness. The Vickers hardness of pure platinum is 56 HV while platinum with 50% of iridium can reach over 500 HV.