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October Birthstone Necklaces
October birthstone necklaces feature two remarkable gems: opal and tourmaline. Opal displays a phenomenon called play-of-color, where spectral hues shift across the stone's surface. Tourmaline occurs in pink, green, and watermelon varieties, each with distinct trace element compositions. Our collection includes 431 necklaces set in .925 sterling silver, with natural stones sourced from Australia, Ethiopia, Brazil, and Afghanistan. Prices range from $479 to $38,569, and every order ships free within the United States.
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Natural Opal and Tourmaline in Sterling Silver
Opal forms over millions of years as silica-rich water seeps into rock crevices and evaporates, leaving behind microscopic spheres that diffract light. Australian opals tend toward a white or black body color, while Ethiopian opals often appear more translucent. Opal ranks 5.5 to 6.5 on the Mohs hardness scale, which means these stones benefit from protective settings and mindful wear. Tourmaline is a boron silicate mineral that achieves its color range through iron, manganese, and lithium content. Pink tourmaline from Brazil carries soft rose tones; Afghan specimens can show deeper raspberry hues. At 7 to 7.5 on the Mohs scale, tourmaline offers greater durability for daily wear. Both stones have represented October since 1912, when the American National Retail Jewelers Association standardized birthstone lists. Each necklace in this collection pairs natural October birthstones with solid sterling silver chains and settings. Browse by stone type, price, or pendant style to find what fits.Frequently Asked Questions
What are the two birthstones for October?
October has two official birthstones: opal and tourmaline. Both were designated by the American National Retail Jewelers Association in 1912 and remain the recognized choices today.
Is opal too soft for a necklace?
Opal rates 5.5 to 6.5 on the Mohs hardness scale, making it softer than tourmaline but suitable for necklaces since pendants receive less impact than rings. A bezel setting offers additional protection.
Where do natural opals and tourmalines come from?
Quality opals originate in Australia, Ethiopia, and Mexico. Tourmaline deposits are found in Brazil, Afghanistan, Nigeria, and Madagascar, with each region producing distinct color profiles.
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