A ring with a clear gemstone is dropped into water. The gemstone becomes invisible under water.?
156975
I will not do your homework for tou.\n\nDo a Google search on "refractive index" for both water and diamond. There is your answer.\n\n Come back if you have any points you don't understand. Asking other people to do your homework is not just dishonest and lazy it is really stupid.
1085201
Total internal reflection. A diamond has a high index of refraction - about 2.418 - one of the highest among natural gemstones. Air, by contrast, has an index of refraction about 1. When a light ray enters one of the surfaces or facets of a diamond at any angle except directly perpendicular ("normal") to the surface, it is refracted (bent) toward the perpendicular (normal) to the surface.  The light ray continues to travel inside the diamond until it reaches another edge.\n\nHere is where it gets interesting.  If the angle that the light ray makes with that surface is large enough, the light ray cannot refract - bend enough - to exit the diamond. Instead, it is "totally internally reflected" and that light passes through the diamond to another edge (facet).  There, if the diamond is properly cut, it will exit the diamond, giving the diamond a sparkle as many rays of light entering from other directions are also totally internally reflected. \n\nOver the years, gem cutters have learned the proper angles that will maximize the total internal reflection - that is, trap as much light from as many different directions as possible and cause it to exit the diamond through other facets.
555685
the liquid evaporating
115295
I believe it's the percent of light that bounces back and doesnt go through. Like a mirror reflects 95% of light. Dunno could be how much a material bends light, like water, cant remember.
421627
When you see colors in the rock, it's an imperfection.  Hold it to a light.  But ultimately take it to a jewler.
149000
maybe like salt crystals diluted in water and then when you paint on paper with that water and let the water evaporate, the salt crystals are left behind on water. you can see it. just an idea? \nlike when water evaporates, all teh minerals in water are  left behind. so when you boil water and hold the lid above the steam, the droplets that form on the lid is pure H2O, because all teh minerals are left behind in the pot.
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Water is transparent cause it was meant to be like that.
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Water magnifies the power of UV rays in light.
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Tiger's Eye (Alexandrite)\nIt's cool the way the gem is one color is indoor light and another color in sunlight.
793786
It is the ability for a liquid to pass through a seemily watertite skin
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The salt gets dissolved in the water.
129313
The curvature of the rainbow is a consequence of having only those raindrops that are at the vertices of 42 degree angles between you and the sun. The collection of all these raindrops is of course an arc. \n\nThe light enters the raindrop from behind you, and bounces off its back surface. The colors separate, because each color has a different speed in the water, and therefore refract a different amount.
639495
Anything is visible beacuse either light emitted from it, or light reflected from it reaches our eyes. If light passes through something completely, it will not be reflected to our eyes, and the object will become transparent or invisible. Glass comes very near this.
307165
Electric static in the air causes lightening to flash over the water.
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Put it in a graduated cylinder, record the water level, drop the rock in, and note the new water level. Subtract.\n\nYay science.
305755
Why not take a page from Archimedes' Eureka! moment?\n\nMeasure the density, then ask a jeweler.
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It depends.  Wood floats on water, as does ice.  Rocks sink.