Garnet, called ziyawu or ziyawu in ancient China, is a group of minerals that have been used as gemstones and abrasives in the bronze age. The common garnet is red. Garnet English “garnet” comes from Latin “granatus” (grain), which may come from “Punica granatum” (pomegranate). It is a plant with red seeds, and its shape, size and color are similar to some garnet crystals.
Agate is a kind of chalcedony mineral, often mixed with opal and cryptocrystalline quartz banded block, hardness 6.5-7 degrees, specific gravity 2.65, color is quite hierarchical. Having translucency or opacity.
Yellow sapphire is also known as topaz in business. A variety of yellow gem grade corundum. The color ranges from light yellow to canary yellow, golden yellow, honey yellow and light brown yellow, with golden yellow being the best. Yellow is generally associated with the presence of iron oxide.
The common color of diopside is blue-green to yellow-green, brown, yellow, purple, colorless to white. Luster for glass luster. If chromium is present in diopside, the mineral has a green tinge, so diopside gems are often confused with other gems such as yellow-green olivine, (green) tourmaline, and chrysoberite, which of course depend on other physical differences between the minerals to distinguish them.
Aquamarine quality is evaluated from color, clarity, cut and weight. Pure color, no gray, no dichroism, thick and bright color of the highest value. Some aquamarine with directional inclusions can be processed into cat’s eye effect or starlight effect, and aquamarine with special optical effect is more expensive. Aquamarine with the same color, clarity and cut is more valuable if it weighs more.
Citrine varies in color from yellow to light brown and is easily confused with citrine. The yellow color in citrine is due to the presence of iron oxide in water. Natural citrine is scarce and produced in few places, with only Brazil and Madagascar producing high-quality Citrine in limited quantities.
The distinguishing features of natural and Synthetic
Green sapphires cut dark blue protolith to show the multidirectional color of green or blue-green on the front, then natural green sapphires can be formed.
The color changing Sapphire in Corundum is real, it will appear different colors in different light, also known as color changing corundum or color treasure, the color change is expected to be caused by the chrome element in corundum.
Amethyst is a tripartite crystal system, the crystal is hexagonal columnar, the cylindrical surface is transverse, there are left shape and right shape, twin-crystal is very common. The hardness is 7. The crystal often contains irregular or winged gas-liquid inclusions.
Aquamarine quality is evaluated from color, clarity, cut and weight. Pure color, no gray, no dichroism, thick and bright color of the highest value. Some aquamarine with directional inclusions can be processed into cat’s eye effect or starlight effect, and aquamarine with special optical effect is more expensive. Aquamarine with the same color, clarity and cut is more valuable if it weighs more.
The color changing Sapphire in Corundum is real, it will appear different colors in different light, also known as color changing corundum or color treasure, the color change is expected to be caused by the chrome element in corundum.
Spinel is a mineral composed of magnesium and aluminum oxide, because it contains magnesium, iron, zinc, manganese and other elements, they can be divided into many kinds, such as aluminum spinel, iron spinel, zinc spinel, manganese spinel, chrome spinel and so on.