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anniversary gifts diamonds - the four C's all about gems characteristics of pearls birthstones & their relevant months january february march april may june garnet amethyst aquamarine diamond emerald pearl symbol of faith, truth & friendship symbol of wisdom, strength & confidence symbol of peace & tranquility symbol of everlasting love & perfection symbol of growth & fertility symbol of purity, Aphrodite, the Goddess of Love july august september october november december ruby peridot sapphire opal citrine turquoise symbol of happiness & good fortune symbol of warmth & charity symbol of faith & goodness symbol of hope & inspiration symbol of truth & integrity symbol of strength & intelligence average weight by size shape round size in mm 2 2.5 3 3.5 4 5 6 7 stone sapphire ruby garnet weight in ct 0.04 0.08 0.15 0.25 0.35 0.65 1.00 1.60 stone topaz weight in ct 0.035 0.07 0.15 0.20 0.30 0.60 1.00 1.60 stone tanzanite peridot tourmaline weight in ct 0.035 0.07 0.13 0.20 0.25 0.50 0.90 1.25 stone emerald aquamarine amethyst citrine lolite weight in ct 0.028 0.055 0.10 0.15 0.23 0.45 0.80 1.20 average weight by size shape oval square size in mm 5x3 6x4 7x5 8x6 9x7 10x8 12x10 14x10 2x2 3x3 4x4 stone sapphire ruby garnet weight in ct 0.35 0.60 1.00 1.50 2.20 3.10 6.00 7.25 0.06 0.25 0.45 stone topaz weight in ct 0.30 0.55 0.95 1.45 2.10 3.00 5.80 7.00 0.055 0.25 0.45 stone tanzanite peridot tourmaline weight in ct 0.25 0.50 0.90 1.35 1.80 2.50 4.00 6.00 0.05 0.20 0.40 stone emerald aquamarine amethyst citrine lolite weight in ct 0.22 0.45 0.75 1.20 1.70 2.40 4.10 5.10 0.04 0.15 0.35 colour varieties blue or violet blue sapphire tanzanite aquamarine blue topaz tourmaline (indicolite) iolite amethyst blue zircon blue spinel lapis lazuli turquoise green emerald green sapphire tzavorite tourmaline (green, chrome) jade apatite diopside dioptase green agate malachite red or pink ruby pink sapphire tourmaline (rubellite) garnet rhodolite, almandine, pyrope red spinel pink topaz kunzite morganite rose quartz rhodochrosite yellow or orange yellow sapphire citrine yellow topaz yellow tourmaline yellow beryl (heliodor) spessartite cornelian fire opal amber moh's table of hardness hardness refers to scratch-resistance 10 9 8 7.5 - 8 7 - 7.5 7 diamond ruby sapphire spinel topaz emerald aquamarine garnet lolite tourmaline amethyst citrine 6.5 - 7.5 6 - 6.5 5.5 - 6.5 5 - 6 5 2.5 zircon agate peridot tanzanite moonstone opal lapis lazuli turquoise glass amber