Stamp: Gem diamonds (Botswana 1974)
Gem diamonds (Botswana 1974)
01 July (Botswana ) within release Minerals goes into circulation Stamp Gem diamonds face value 20 Botswana cent
| Stamp Gem diamonds in catalogues | |
|---|---|
| Stamp Number: | Sn:BW 122 |
Stamp is square format.
Also in the issue Minerals:
- Stamp - Amethyst face value 1;
- Stamp - Quartz face value 3;
- Stamp - Copper Nickel face value 4;
- Stamp - Moss agate face value 5;
- Stamp - Agate face value 7;
- Stamp - Agate face value 2;
- Stamp - Stilbite face value 10;
- Stamp - Moshaneng banded marble face value 15;
- Stamp - Gem diamonds face value 20;
- Stamp - Chrysotile face value 25;
- Stamp - Jasper face value 35;
- Stamp - Moss quartz face value 50;
- Stamp - Citrine face value 1;
- Stamp - Chalcopyrite face value 2;
Stamp Gem diamonds it reflects the thematic directions:
A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or polished, is used to make jewelry or other adornments. Certain rocks (such as lapis lazuli, opal, and obsidian) and occasionally organic materials that are not minerals (such as amber, jet, and pearl) may also be used for jewelry and are therefore often considered to be gemstones as well.Most gemstones are hard, but some softer minerals such as brazilianite may be used in jewelry because of their color or luster or other physical properties that have aesthetic value. However, generally speaking, soft minerals are not typically used as gemstones by virtue of their brittleness and lack of durability
In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form
