UTS Unique Tracking System Write UNI Terms & Conditions   ABOUT US ACCREDIATIONS GEMOLOGY GEM STONES ONLINE SHOPPING KNOW YOUR LUCKY STONE CONTACT US HOME Gemology Table of Birthstones........................................................................................................................ Month Color Official January Dark red Garnet February Purple Amethyst March Pale blue Aquamarine April White (transparent) Diamond May Brght green Emerald June Cream Pearl July Red Ruby August Pale green Peridot September Deep blue Sapphire October Variegated Opal November Yellow Topaz December Sky – blue Turquoise Table of gemstones differentiate to colors....................................................................................... Stone H S.G R.I SR/DR T Remarks Aquamarine 7.5 2.71 1.57-1.58 Double T Imitated by synthetic spinel and glass Chalcedony 6.5 2.62 1.53 Double T May imitate some moonstones Diamond 10 3.52 2.42 Single T Natural coloured stones conduct electricity Doublet (1) 8 3.69 1.73 Single T Synthetic white spinel top and base, with coloured layer Doublet (2) 7.5 V 1.78 Single T Garnet top and glass base Doublet (3) 9 3.99 1.77 Double T Natural sapphire top with synthetic sapphire base Eilat stone 5 2.8 1.50 -------- O A mixture of copper minerals Glass 6 V V Single T Bubbles and striae may be seen Iolite 7 2.61 1.53-1.54 Double T Lower specific gravity and refraction than sapphire Jadeite 7 3.34 1.65 Double TI A rare colour for jadeite Lapis lazuli 5.5 2.85 1.50 Single O Usually shows specks of brassy pyrites Moonstone 6 2.55 1.53-1.54 Double T Beat stones show bluish flash Rutile 6.5 4.25 2.62-2.90 Double T Synthetic stone showing large doubling of the back facets Sapphire 9 3.99 1.76-1.77 Double T The synthetic stones show curved banding Spinel 8 3.60 1.72 Single T Weak reddish under the colour filter Spinel (synthetic) 8 3.63 1.73 Single T Strong red under the colour filter Sodalite 5.5 2.30 1.48 Single O Resembles lapis lazuli, usually no pyrites Swiss Lapis 6.5 2.6 1.54 Double O Dyed jasper to imitate lapis lazuli Topaz 8 3.56 1.61-1.62 Double T Denser than aquamarine which it resembles Tourmaline 7.5 3.08 1.62-164 Double T Doubling of the back facets readily seen Turquoise 6 2.7 1.62 -------- O Often waxed or treated Zircon 7.5 4.68 1.92-1.98 Double T Stong doubling of the back facets can be seen Zoisite (Tanzanite) 6 3.35 1.69-1.70 Double T Has directional colour changes of violet, blue and brown H=Hardness; S.G.=Specific Gravity; RI=Refractive indices; SR/SD= Single / Double Refraction T=Transparency Copyright 2012 Nice Gems. All rights reserved Powered by Ideogram Technology Solutions Pvt. Ltd.