coral is so colourful because the light shines on it and gives it a tan of colour

The best you can do is to get a diamond grading report from the Gemological Institute of America. The reports tell you everything about the diamond, from the color, cut, clarity and how big the diamond is. The report will immediately know if the gem is fake or not.
The value of a diamond depends on its cut, its clarity, its colour and its carat weight. A local jeweler can give you the answer you want.

they love licking them

how to polish a cut scratched amethyst stone

The opals are often found filling former gas cavities in a reddish to pinkish rhyolite lava flow, the colour of the opals vary from white to a reddish orange to colourless, some of them are transparent and other translucent.

Opals in Queensland are mined at Yowah, just outside of Quilpie in the far west of the state.

Mystic quartz is similar to mystic topaz. Each are white (colorless) stones to start with, then a treatment is applied to offer it in the mystic color.

The treatment was originally developed for topaz stones. As demand grew, scientists figured out the way to apply their therapy to quartz at the same time. Why is that great? three causes: (1) Quartz and topaz share equivalent optical properties, so you cannot tell the difference visually. (2) Quartz is readily out there in bigger sizes. (3) Quartz has a lower precise gravity than topaz -- therefore, with two stones from the same exact size, the quartz will weigh much less by about 30%, yielding tremendous price savings.

Gemstones that come in yellow include:

Citrine

Quartz

Heated Amethyst

Nitrogen-filled diamonds (a sign of impurity)

Sunstone

Moonstone

Hyalite

Opals

Iolite

Kernite

Nephrite

Jade

HDS is the maker's mark for Helzberg Jewelers.

yep

^That answer is 100% false. Yellow topaz is NOT the same as citrine. Though they appear similar in color, they are chemically very different. Citrine is a quartz crystal and topaz is mineral crystal and therefore the more expensive of the two stones.

The largest and most expensive pearl ever to be found is known as the "Pearl of Lao Tzu," although it is sometimes referred to as "The Pearl of Allah." It measures 9.45 inches in diameter and weighs 14.1lbs. It is approximately 31,893.5 carats. The pearl itself is valued at nearly 60 Million dollars and was extracted from a giant clam off the coast of Palawan in 1934 by a Filipino diver. It was given to an American (Wilburn Cobb), as a token of gratitude for his life saving measures of the Palawan Village Chief's son. The pearl has had many potential buyers, but currently remains in the ownership of the Pearl For Peace foundation, a charitable organization.

The weight of a small quantity of obsidian is 17g

Herkimer diamonds are a beautiful yet very common form of quartz, found in the area around Herkimer, NY. They are generally not very expensive at all, but price depends on size, clarity, lack of damage, and whether they're on matrix. A nice little 1cm crystal should be under $10, but I've seen fabulous interconnected chains of crystals 30cm high going for $2,000, and worth it.

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very cheap i went on a Sunday it was about 8 dollars for a day pass and renting equipment was only 1 dollar per tool, great way to spend a day, we had fun and had some decent finds.

Gold is heavier than diamond.

Diamonds have a specific gravity of 3.51. Gold has a specific gravity of 19.32.

naturally forming or cultured, such pearls are formed in the oyster or mussel and are not fakes. The real difference in the totally natural pearl and the cultured pearls is what makes the pearl start to grow and the thickness of the nacre. Nacre is the pearly layers that make a pearl so lovely. The natural pearl will have very thick nacre, generally forming in concentric rings around some starting source or irritation to the mollusk. A large natural pearl is very, very rare. Cultured pearls generally use a "core" of mother-of-pearl, the shell of the mollusk. The bead core goes into the mollusk and nacre is formed around the core. The core determines the overall shape of the pearl. How long the oyster is allowed to let the pearl grow determines the thickness of the nacre. Thicker nacre is better. Best of all is thick nacre and a smooth, almost blemish free surface. Pearls grown inside the mussel or oyster do have a gritty feel to the tooth. Fake pearls are made by coating a core of some sort (mother-of-pearl, plastic, etc.) with a plastic, a kind of paint containing ground fish scales or other stuff that look pearly to the eye. Generally, the fakes do NOT have a gritty feel to the tooth. Try rubbing or tapping your pearl (cultured or natural) against your tooth it will feel gritty indicating its real and if the pearl feels smooth it is fake but this requires some practice. Sometimes customers interested in buying pearls are concerned that they won't know the real thing from the imitation. Here are some tests to help you determine if you are looking at well-done 'fakes' or genuine pearls. Touch Test An old wives' tale says that if you hold real pearls in your hand, they will be cool to the touch for several seconds before warming up. Genuine pearls tend to warm with contact to the skin much faster than glass pearls. Resin or plastic pearls tend to feel somewhat warm upon first contact. This however is not a sure-fire method for checking authenticity. The Tooth TestRub the pearls lightly along the biting edge of your upper front teeth. If they feel slightly rough, sandy or gritty, it's likely they are cultured or natural pearls because of the layers of nacre that have formed over time. If they feel smooth or glassy, they are probably imitations. That's because the imitations are made by dipping a plastic or glass bead into some sort of paint, sometimes including iridescent fish scales. You will also get the same result (rough, sandy, or gritty) if two pearls are rubbing together.

It will slowly cause the coral to dissolve. Rainwater is slightly acidic, and the calcium carbonate that makes up coral will react with an acidic solution. However, unless an area is severely affected by acid rain, the effect will take centuries to dissolve a notable amount of it.

Amber is tree sap that hardened millions of years ago (in the usual way sap released from a tree hardens) then was fossilized.

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