Our range includes jewellery with natural gemstones: necklaces, rings, pendants, earrings and bracelets with rubies, sapphires, diamonds, moldavites, tourmalines, opals, tanzanites, pearls and dozens of other stones. Alongside the classic stones, we try to offer you unconventional minerals or unconventional forms of them \u2013 for example yellow, orange or pink sapphires alongside blue ones. Most of our jewellery is made of 925\/1000 sterling silver, some of it of 585\/1000 gold.<\/p>","link":"https:\/\/4cminerals.cz\/en\/product-category\/jewellery\/","name":"Jewellery","slug":"jewellery","taxonomy":"product_cat","parent":0,"meta":{"details":"
When choosing jewellery, the look of the stone matters, but so does how often and on what occasions you will wear it. Every stone can withstand something different, so it is worth knowing how durable it is.<\/p>\n
The hardness of a stone is measured on the Mohs scale from 1 to 10. Diamond has 10, ruby and sapphire (corundum) 9, topaz 8 and quartz \u2013 for example amethyst, citrine or rock crystal \u2013 7. However, the scale is not linear. Diamond is many times more scratch-resistant than corundum, even though it is only one step higher on the scale.<\/p>
Harder stones are better suited to a ring you wear every day. Softer stones are more suitable for pendants and earrings, which are less exposed to wear, or for jewellery for special occasions. Store your jewellery separately, as a harder stone can scratch a softer one \u2013 for example, a diamond will scratch a topaz.<\/p><\/div>
Hardness is not the only physical property that determines the durability of a stone. Cleavage must also be taken into account \u2013 the tendency of a stone to split along crystallographically oriented planes. Fluorite, for example, breaks along the flat faces of an octahedron when struck. Stones with perfect cleavage are less resistant to impact than those without cleavage.<\/p><\/div>
The mechanical durability described above is not the only factor determining the overall durability of a stone. Another key factor is its chemical resistance. Some fairly hard stones are not entirely suitable for everyday rings because they dissolve in acids, even mildly concentrated ones. Such solubility gradually shows, for example, with intensive washing of dishes.<\/p>
Few people know that diamond, the hardest of all natural stones, will burn even in a candle flame. You need to protect your stone.<\/p><\/div>
Stones containing numerous fluid inclusions (for example emeralds, opals or certain types of rock crystal) react strongly to changes in temperature; stress builds up inside them and they can crack or even shatter if, for example, you immerse them in hot water. These stones can react in the same way to ultrasonic cleaning. That is why they are recommended for rings for special occasions, and for earrings and necklaces, where they are not exposed to such risks.<\/p><\/div><\/div>\n
Our range includes three ways of working a stone. Faceted<\/strong> stones are cut into facets that reflect light, making the stone sparkle. Smooth<\/strong> stones \u2013 cabochons and beads \u2013 show the colour and pattern of the stone, and with labradorite, moonstone or opal also its optical effects. Unworked<\/strong> stones retain the natural shape of the crystal or, thanks to their sculpted surface, are unique natural creations (for example moldavites or obsidians).<\/p>\n Most of our jewellery is made of 925\/1000 silver, an alloy containing 92.5% silver, traditionally known in English-speaking countries as sterling silver. Some pieces are made of gold-plated silver, i.e. silver covered with a layer of gold. Our gold jewellery is mainly 585\/1000 (14 carat) and occasionally 750\/1000 (18 carat). We state the fineness of the metal for every piece.<\/p>\n You can also choose jewellery by a specific stone:<\/p>\nSilver or gold<\/h3>\n
Jewellery by type<\/h2>\n
Jewellery by stone<\/h3>\n