What is a pearl? Pearl is a kind of ball body formed by some shellfish in the ocean or fresh water due to the foreign matter that enters (or manually puts in) the body, and the pearl liquid which is secreted by the body is wrapped by the outer layer. Its chemical composition is mainly calcium carbonate. The pearls can be divided into seawater beads, freshwater pearls and artificially cultivated pearls according to different yields. The white beads with white base color can be divided according to color. The black base of the texture is black and variegated. Beads. What is crystal? Crystal is one of the narrow gemstones and is a very old gem. Its chemical composition is silica. This is a crystal that is transparent like water in quartzite minerals (although crystals are opaque, they can only be called quartz crystals). If it is purple, brown or black due to impurities, it is called amethyst, tea crystal and ink crystal; the special variety containing needle or fibrous mineral inclusions inside is called ‘crystal’ Fake Bulgari ring Jewelry Cheap. The crystal face is glassy, and its shell-like fracture is grease-like; the hardness is 7, the specific gravity is 2.66, and it has a pressure-sensitive and optical property. Crystals are widely used in jewelry. They are mainly used as bracelets and necklace beads.
They also make small pendants and ornaments. Crystals are mainly produced in Brazil and Uruguay. The main producing areas in China are Yangjiaoling in Hainan Province and the East China Sea in Jiangsu Province. Natural crystals are clear and transparent, often containing star-like, cloud-like or floc-like gas-liquid inclusions, and microcracks are often seen. Synthetic crystals have no cracks, but often have small bubbles. In addition, the amount of synthetic crystal can be felt by hand to be larger than natural crystal. Compared with glass, the crystal is white and bright and dazzling Replica Bulgari ring. The glass white is slightly blue, yellow and bright. The crystal hardness is 7, the glass is 5.5, the crystal can be used to cut the glass, the natural crystal often contains uneven cotton, etc. Phenomenon, and the glass is artificially baked, often uniform without cotton, and has tiny bubbles. The tongue crystal has a cool feeling, and the glass has a warm feeling. What are sister gemstones – rubies and sapphires? Ruby and sapphire are beautiful and transparent corundum. Their chemical composition is aluminum oxide. When pure, it should be colorless. It contains a small amount of pigment ions and has different colors, such as chrome-containing red color – ruby. Titanium and iron are blue – sapphire. Red and blue treasures are transparent to translucent, glass luster, with obvious pleochroism under dichroic mirror, hardness of 9, and specific gravity of 4; shell-like fracture, no cleavage; under ultraviolet light, ruby is obvious Red fluorescent; sapphire is not fluorescent except for individual varieties produced in Sri Lanka and Kashmir. The main countries producing rubies in the world are Myanmar, Sri Lanka and Thailand, and the main countries producing sapphire are Australia, Thailand, Myanmar, Sri Lanka and China. Red sapphire is often used as a high-end jewelry such as ring face, female boutonniere, earrings, and tie clips.