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<p>[QUOTE=&quot;Wanttoknow, post: 10528810, member: 1987&quot;][USER=13823]@Curioser[/USER] I forgot to add one: I think your earrings made with Amethyst. In USSR Amethyst was using with Sterling, but Charoite with Cupronickel.</p><p>Because Amethyst was more expensive than Charoite. </p><p><br /></p><p><b>First group: jewelry (precious) stones</b></p><p>1st order — diamond, emerald, blue sapphire, ruby.</p><p>2nd order — alexandrite, sapphire (orange, purple and green), pearl, noble black opal, noble jadeite.</p><p>3rd order — demantoid, noble spinel, noble white and fire opal, aquamarine, topaz, rhodolite, adularia, red tourmaline.</p><p><b>4th order</b> — tourmaline (blue, green, pink and polychrome), chrysolite, zircon, beryl (yellow, golden and pink), noble spodumene, turquoise, <b>amethyst</b>, pyrope, almandine, chrysoprase, citrine.</p><p><br /></p><p><b>Second group: ornamental and semi-precious stones</b></p><p>1st order — lapis lazuli, jadeite, nephrite, malachite, aventurine, <b>charoite</b>, amber-succinite, rock crystal, smoky quartz, hematite (bloodstone).</p><p>2nd order — agate, colored chalcedony, cacholong, amazonite, heliotrope, rhodonite, rose quartz, opaque and iridescent feldspars (belomorite and others), iridescent obsidian, common opal.</p><p><br /></p><p>Third group: ornamental stones</p><p>Jasper, inscribed granite, petrified wood, marble onyx, listvenite, obsidian, jet, jaspilite, selenite, fluorite, aventurine quartzite, agalmatolite, patterned flint, colored marble.</p><p><br /></p><p>Jewelry (precious) stones include minerals (mainly crystals) that are transparent, less often translucent, colorless or have a beautiful, pure and uniform color, bright shine, high hardness, and wear resistance. Exceptions are opals, turquoise, and pearls, a mineral of organic origin and low hardness.</p><p>Ornamental stones include rocks whose decorative properties are used in products with a large surface area (tens of square centimeters).</p><p>Ornamental and decorative stones are minerals that are used as both ornamental and jewelry materials.[/QUOTE]</p><p><br /></p>

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