Amber

Newly created resins (copal), other synthetic resins and yellow glass. Ambroid is made from smaller pieces of the genuine amber, which are welded at 140-250 degrees C (284-482 degrees F) and 3000 atmospheres pressure into a substance that is easily mistaken for natural amber. - Gemstones of the world, Walter Schumann, 2001, p 228 2 to 2.5Walter Schumann, Gemstones of the world (2001) More from other references 1.05 to 1.10Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references BrittleWalter Schumann, Gemstones of the world (2001) NoneWalter Schumann, Gemstones of the world (2001) ConchoidalArthur Thomas, Gemstones (2009) 1.539 to 1.545Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references IsotropicUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) NoneWalter Schumann, Gemstones of the world (2001) AbsentWalter Schumann, Gemstones of the world (2001) YesUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) Yellow, white, red, green, blue, brown, blackUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references Blue to green, yellow to orange to red to brown, Fluorescence under visible light in Dominican amber; blue is due to light (Rayleigh) scattering in Baltic amber Charge-transfer processes in large organic moleculesW. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011) Transparent,Translucent,OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references ResinousArthur Thomas, Gemstones (2009) Bluish-white to yellow-greenWalter Schumann, Gemstones of the world (2001) More from other references Common moderate to strong (chalky)-blue to yellow-(green)Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) AmorphousHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Amber information at mindat.org Baltic Sea  Dominican Republic  Italy  Myanmar  Peru  Russia