Amber usually varies from transparent to translucent. When a translucent amber looks white to yellow in color, it can be called the beeswax. Amber and beeswax almost have the same spectra, however, their appearance varies greatly. In this study, scanning electron microscopy (SEM), gem microscope and infrared spectroscopy were employed to investigate amber from Baltic Sea. Beeswaxed-amber and transparent amber show similar infrared spectra characteristics, suggesting that chemical composition is not the factor influencing their appearance. SEM images show that there are numerous bubbles on the surface of beeswaxed-amber. The diameters of the bubbles are generally less than 20 μm, with the majority around 5 μm. Combined with the microscopic observations, it is inferred that the appearance of the Baltic beeswax is related to the bubbles inside, and the beeswaxes with lower transparency and whiter color grade commonly contain much smaller and denser bubble inclusions.