New environmental information for the gas goliaths shows that carbon is bountiful in its amazing precious stone structure, they say.
Lightning storms transform methane into sediment (carbon) which as it falls solidifies into lumps of graphite and afterward precious stone.
These jewel "hail stones" at last liquefy into a fluid ocean in the planets' hot cores, they told a gathering.
The greatest jewels would almost certainly be about a centimeter in width - "sufficiently large to put on a ring, despite the fact that obviously they would be whole," says Dr Kevin Baines, of the University of Wisconsin-Madison and Nasa's Jet Propulsion Laboratory.
He added they would be of a size that the late film entertainer Elizabeth Taylor would have been "pleased to wear".
"Basically 1,000 tons of precious stones a year are being made on Saturn.
"Individuals ask me - how might you truly tell? Since it is highly unlikely you can proceed to notice it.
"Everything reduces to the science. Furthermore, we believe we're really sure."
Tempest back streets
Baines introduced his unpublished discoveries at the annual meeting of the Division for Planetary Science of the American Astronomical Society in Denver, Colorado, close by his co-creator Mona Delitsky, from California Speciality Engineering.
picture captionGigantic storms on Saturn make dark billows of residue - which solidifies into jewels as it falls
Uranus and Neptune have for quite some time been thought to hold gemstones. Be that as it may, Saturn and Jupiter were not idea to have reasonable airs.
Baines and Delitsky investigated the most recent temperature and pressing factor expectations for the planets' insides, just as new information on how carbon carries on in various conditions.
They reasoned that steady precious stones of jewel will "hail down over a gigantic district" of Saturn specifically.
"Everything starts in the upper air, in the rainstorm back streets, where lightning transforms methane into ash," said Baines.
"As the ash falls, the tension on it increments. What's more, after around 1,000 miles it goes to graphite - the sheet-like type of carbon you find in pencils."
By a profundity of 6,000km, these lumps of falling graphite harden into jewels - solid and lifeless.
These keep on succumbing to another 30,000km - "around over two Earth-ranges" says Baines.
"When you get down to those limit profundities, the pressing factor and temperature is so awful, its absolutely impossible the jewels could stay strong.
"It's exceptionally dubious what befalls carbon down there."
One chance is that a "ocean" of fluid carbon could shape.
"Jewels aren't always on Saturn and Jupiter. Yet, they are on Uranus and Neptune, which are colder at their centers," says Baines.
'Unpleasant precious stone'
The discoveries are yet to be peer looked into, yet other planetary specialists reached by BBC News said the chance of precious stone downpour "can't be excused".
"The possibility that there is a profundity range inside the airs of Jupiter and (surprisingly more so) Saturn inside which carbon would be steady as jewel appears to be reasonable," says Prof Raymond Jeanloz, one of the group who first anticipated precious stones on Uranus and Neptune.
"What's more, given the enormous sizes of these planets, the measure of carbon (accordingly precious stone) that might be available is not really irrelevant."
Anyway Dr Nadine Nettelmann, of the University of California, Santa Cruz, said further work was expected to comprehend whether carbon can frame precious stones in an air which is wealthy in hydrogen and helium - like Saturn's.
picture captionThe planet 55 Cancri e may not be so valuable all things considered, another investigation proposes
"Baines and Delitsky thought about the information for unadulterated carbon, rather than a carbon-hydrogen-helium combination," she clarified.
"We can't bar the proposed situation (precious stone downpour on Saturn and Jupiter) however we essentially have no information on blends in the planets. So we couldn't say whether precious stone development happens by any stretch of the imagination."
Then, an exoplanet that was accepted to comprise to a great extent of jewel may not be so valuable all things considered, as indicated by new examination.
The alleged "jewel planet" 55 Cancri e circles a star 40 light-years from our Solar System.
An examination in 2010 proposed it was a rough world with a surface of graphite encompassing a thick layer of jewel, rather than water and rock like Earth.
But new research to be distributed in the Astrophysical Journal, calls this end being referred to, making it impossible any space test shipped off example the planet's innards would uncover anything shining.
Carbon, the component jewels are made of, presently seems, by all accounts, to be less plentiful corresponding to oxygen in the planet's host star - and likewise, maybe the planet.
"In view of what we know now, 55 Cancri e is to a greater degree a 'treasure waiting to be discovered'," said creator Johanna Teske, of the University of Arizona.
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