The most difficult gemstones riddles A list of gemstones related questions that are most often answered incorrectly Culture quiz What was used as a unit of mass in the classical times?Carob seed. Carat, a unit of mass equal to 200 mg, is derived from a carob seed (Greek kerátion). People commonly believed that the seeds have unusually low variability in mass. Modern research denied this claim.very hard 36% carob seedcarob seed36%a drop of leada drop of lead11%handful of sandhandful of sand37%swallow's eggswallow's egg14%Created by: globalquiz.org. Statistics based on 4551 answers in 4 languages »units riddles » Where are emeralds found the most?In Colombia. Colombia is by far the world's largest producer of emeralds, constituting 50–95% of the world production. The Colombian emeralds are also the purest. The emerald trade is at the center of funding of ongoing civil conflict in Colombia, second to drug trade.hard 40% in South Africain South Africa36%in Colombiain Colombia40%in Siberiain Siberia11%in Argentinain Argentina10%Created by: globalquiz.org. Statistics based on 5828 answers in 2 languages »Colombia riddles » What is the Greek name for amber?Elektron. Words like "electricity" come directly from the name of amber. Already the ancient Greeks noticed that this stone has a certain mysterious property: when rubbed with fur, it begins to attract particles of dust...hard 43% particlonparticlon12%elektronelektron43%amberionamberion27%atomiosatomios16%Created by: Marta_Smolarek. Statistics based on 4419 answers in 2 languages »technology riddles » What mineral is a heliodor gemstone a variety of?Beryl. Heliodor is a yellow transparent variety of beryllium (emerald and aquamarine are also varieties of beryllium). The name derives from the Greek word helios = sun (sun-god) and doron = gift ("gift of the Sun").hard 49% TopazTopaz25%RubyRuby12%BerylBeryl49%TalcTalc12%Created by: Paweł Kołodziejczyk. Statistics based on 4336 answers in 2 languages »minerals riddles » Where do you have the best chance to find a natural diamond?Near the volcano. It is sometimes mistakenly believed that diamonds are made from coals. High pressure and heat is required for the formation of diamonds from carbons but these carbons are not the ones that form coal. Diamonds are formed deep under the surface and are brought up during outbreaks of volcanoes.hard 54% near the volcanonear the volcano54%in the coal minein the coal mine31%in the silver minein the silver mine7%at the beachat the beach5%Created by: Monica Stiller. Statistics based on 6082 answers in 4 languages »nature riddles » What colour is emerald colour a shade of?Green. The name derives from the Greek smaragdos (as well as Lat. smaragdus - green). It refers to the characteristic colour of emerald stones.average 60% redred10%greengreen60%blueblue23%purplepurple5%Created by: Paweł Kołodziejczyk. Statistics based on 3440 answers in 2 languages »colors riddles » What colour is sapphire colour a shade of?Blue. The name of the colour comes from sapphire, a blue variety of the corundum.average 61% redred8%greengreen19%blueblue61%purplepurple10%Created by: Paweł Kołodziejczyk. Statistics based on 3534 answers in 2 languages »colors riddles » Play culture quiz and see all the questions.