August Birthstone Jewelry — Peridot Necklaces & Gifts

Peridot is exclusively green — ranging from pale yellow-green (lime) to deeper olive green. Unlike most colored gemstones, peridot's green is not caused by trace element impurities but by iron that is integral to the olivine crystal structure. This means no heat treatment or enhancement can change its color — you cannot get a non-green peridot. The most prized peridot color is pure vivid green with minimal yellow or brown undertone, typified by fine Pakistani Kohistan specimens. Arizona peridot (the commercial standard) tends toward olive-green or slightly yellow-green. The warmth of peridot's green — caused by that iron component — is why it is sometimes called the "gem of the sun" or the "evening emerald."

No. Peridot and green diamond are completely different minerals. Peridot is olivine (magnesium iron silicate), Mohs 6.5–7, with color caused by inherent iron content. Green diamond is carbon (same as all diamonds), Mohs 10, with natural green color caused by radiation exposure near the surface that displaces carbon atoms from their crystal lattice — an extremely rare natural phenomenon. Natural green diamonds are among the rarest of all colored diamonds; the famous "Dresden Green" (41 carats) is the world's largest and most famous. Price-wise, fine natural green diamond costs thousands to tens of thousands of dollars per carat; fine peridot costs tens to hundreds of dollars per carat. The two look different to the naked eye: peridot has a warm, slightly yellow green; natural green diamond shows a cooler, more vivid green.

Spinel is magnesium aluminum oxide (MgAl₂O₄), a separate mineral species from corundum (ruby/sapphire) despite centuries of confusion between them. It forms in the same geological environments as ruby and sapphire and occurs in many of the same colors — red, pink, blue, purple — which is why it was so consistently misidentified historically. The key facts about spinel: Mohs 8 hardness (excellent for daily wear); nearly always untreated (most spinel is sold in its natural, as-mined state with no heat treatment or filling, which is very unusual in the colored stone world); full color range (red spinel, pink spinel, cobalt blue spinel, grey spinel); and remarkable value (spinel of equivalent visual quality to ruby or sapphire typically costs a fraction of those stones because it lacks the same market profile).

Spinel is undervalued primarily because of name recognition — consumers know ruby and sapphire as the "prestige" red and blue stones, and spinel lacks the marketing history and cultural cachet of those stones despite being their geological neighbor. The gemological community recognizes spinel's quality: it is nearly always untreated (a major purity advantage), rates Mohs 8 (excellent durability), and produces vivid colors in red, pink, blue, and purple. The famous "Black Prince's Ruby" on the British Imperial State Crown — one of the most storied gemstones in the world — is actually a red spinel. Spinel was formally added to the August birthstone list in 2016 partly to raise its profile. For buyers, the undervaluation is an opportunity: you get genuine gem quality, excellent durability, and natural color at prices well below comparable ruby or sapphire.

Yes, in pendants and earrings. At 6.5–7 Mohs, peridot is hard enough for regular daily wear in jewelry that does not take direct knocks. It is harder than most household abrasives and suitable for the non-impact wear of necklaces and earrings. For rings, the picture is more nuanced: peridot can be scratched by quartz (Mohs 7) found in household dust over time, and it has two cleavage directions that make it somewhat chip-prone from direct impacts. For daily-wear peridot rings, a protective bezel setting is recommended over open prongs. Peridot is also sensitive to acids (including some cleaning products and sweat over time) — clean with neutral soap and water rather than harsh chemicals. Avoid ultrasonic cleaners, which can worsen existing inclusions.

Peridot's green color is unique among gemstones: it is caused not by trace element impurities but by iron that is a fundamental component of the olivine crystal structure (Mg₂SiO₄ where some Mg is replaced by Fe). In most colored gemstones, color comes from trace amounts of foreign elements (chromium for ruby and emerald, iron for blue sapphire, manganese for spessartite garnet). In peridot, iron is part of the mineral's own chemistry — which is why no treatment or enhancement can change its color. The specific shade of green (yellow-green vs. olive vs. vivid green) depends on the iron-to-magnesium ratio and trace amounts of nickel. Higher nickel content correlates with a purer, more vivid green in the finest Pakistani peridot.

Peridot does not fade in normal wear conditions. Unlike amethyst (which can fade from UV exposure) or some dyed stones (which can fade from light or chemicals), peridot's iron-based color is stable. However, peridot can develop a "sleepy" or brownish appearance over time if exposed to prolonged acid contact — some peridot from certain deposits is sensitive to mild acids, including sweat and some cleaning products. This is not fading but rather surface alteration of the stone. Cleaning with neutral pH soap and water, and rinsing thoroughly after wearing, prevents this. The color itself — the iron content — is stable and does not bleach, fade, or change under normal light exposure or typical wear conditions.

Peridot has been called the "gem of the sun" and the "evening emerald" — both names reflect its warm, luminous green quality. Ancient Egyptians mined peridot on the island of Zabargad (now St. John's Island) and called it "gem of the sun," believing it held the power of the sun and protected against night terrors. They sometimes set it in gold as a talisman against evil. In Hawaiian tradition, peridot crystals found in volcanic lava were considered the tears of the volcano goddess Pele. In medieval European tradition, peridot represented strength and healing, and was set in church vessels and clerical jewelry. Today, peridot symbolizes strength, clarity of purpose, and the renewal of summer's energy — a fitting meaning for an August birthday at the season's peak.