photo of a ruler as measurement references

Design

Style Length in inches
Collar 12 - 13
Choker 14 - 16
Princess 17 - 19
Matinee 20 - 24
Opera 28 - 34
Lariat 36 - 42
Bracelet - small 5 1/2 - 6 1/4
Bracelet - medium 6 1/4 - 7
Bracelet - large 7 - 8

Birthstone

Month Stone Alternative Color
January Garnet, rose quartx Siam, garnet, or rose
Feburary Amethyst, onyx Amethyst or jet
March Aquamarine, red jasper Aquamarine
April Diamond, Rock crystal Clear
May Emerald Emerald
June Moonstone, pearl Light topaz, smoky topaz
July Ruby, carnelian Siam or garnet
August Peridot, aventurine Peridot
September Sapphire, lapis lazuli Montana sapphire
October Tourmaline, opal Smoky topaz
November Citrine, topaz Topaz
December Zircon, turquoise Light sapphire or topaz