Australia: Pink Diamond

Pink diamond is a type of diamond which has all the same elements as more commonly known diamonds except that they also exhibit pink color. The source of their pink color is greatly debated in the gemological world but it is most attributed to enormous additional pressure that these diamonds undergo during their formation.

Source: https://en.wikipedia.org/wiki/Pink_diamond
Postcrossing Forum - 2018 January 50 RR [quickbrownfoxph]
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USA: Save Our Oceans

Save Our Oceans - National Park WPA Sentiment
Lantern Press Original Poster #52773

Postcrossing Forum - 3+ stamps tag [savagepink]
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