18K Gold: What This Number Reveals About Your Future Handcrafted Jewelry

You have seen the mention "18k gold" on a product page and you are wondering what it really means for the piece you are about to wear. This number is not an administrative detail: it defines the exact proportion of pure gold contained in the wire, and therefore the very nature of the jewelry. At Atelier Paulin, 750/1000 gold, also called 18k gold, is the solid gold wire we have handcrafted since 2014 in our Paris atelier. In this article, we detail its composition, its hallmark, its care, and what sets it apart from gold-filled, so you can choose the material that truly fits your use.

18k Gold: What Does This Number Really Mean?

The number "750/1000" indicates the proportion of pure gold present in the alloy: 75% gold, the rest made up of other metals that give the wire its strength and resilience. This proportion defines 18k 750 gold, known in France as "the gold of French tradition." It is not a plating nor a thin layer deposited on the surface: it is a solid gold wire, through and through, from start to finish of the handcrafting.

Every piece of 18k gold jewelry handcrafted by the atelier is hallmarked and certified, a guarantee of the actual gold content stated. This step is not cosmetic: the hallmark holds the artisan jeweler who handcrafted the piece accountable.

Unlike 14k gold-filled, also called Gold Filled 14 karat, which is a solid envelope of gold applied to a brass or bronze base, 18k gold is a 75% gold wire throughout its thickness. Both materials have their own logic, but they are not interchangeable in terms of composition.

18k gold comes in three colors: yellow, rose, and white. It is the only one of the atelier's three materials offered in a white version, as gold-filled only exists in yellow and rose. Find all the pieces handcrafted in this material in our 18k gold collection.

18k Gold: How the Wire Becomes Jewelry in the Artisan's Hands

At the atelier, a single 18k gold wire, in one piece, is handcrafted to take the shape of the chosen word, name, or initial. No surface is carved: the gesture consists of sculpting the wire itself, curve after curve, never working on an already finished flat surface. This difference in nature is what sets handcrafting apart from engraving.

Once the word is handcrafted, the piece goes through laser micro-welding, a reinforcement technique applied at the wire's points of tension. The handcrafted wire is therefore micro-welded, which does not keep it from retaining its fluid line. Next comes work hardening: a cold-working of the metal, applied to the entire piece once the handcrafting is complete, never letter by letter. This is what gives the wire its shape memory and resilience over time.

The lettering is entirely in lowercase, except for the "J," which is handcrafted in uppercase when it opens a word. Only one style of writing exists for the handcrafted word: cursive. The "Capital" and "Capital Initial" models, on the other hand, are handcrafted in uppercase, as seen on our yellow 18k gold mantra necklace or its white gold version.

A piece in 18k gold is shipped within 1 to 3 working days.

18k Gold in Yellow, Rose, or White: Which Color to Choose?

18k gold is the only material at the atelier available in three colors: yellow, rose, and white. This choice is not insignificant, as it noticeably changes the final look of the jewelry, especially on personalized pieces where the color of the wire accompanies the shape of the word or initial.

Yellow 18k gold remains the shade closest to French jewelry tradition, warm on every skin tone. Rose gold, softer, highlights the fineness of the wire on delicate pieces such as a bracelet or a ring. White gold, found only in 18k gold, offers a more contemporary and understated look, particularly sought after for personalized wedding bands and rings.

The Original Personalized Bracelet, the atelier's iconic piece, the one it all began with, comes in all three shades: yellow gold, rose gold, and white gold. The Richelieu bracelet follows the same logic of choice, with its three versions in rose gold, yellow gold, and white gold.

To browse more broadly through the available shades, the rose 18k gold and white 18k gold collections bring together all the pieces by color.

18k Gold Versus Gold-Filled: Which Material for Which Use

14k gold-filled, also called Gold Filled 14 karat, is a solid envelope of gold applied by heat or pressure onto a brass or bronze base. It contains 50 to 100 times more gold than traditional gold plating, which gives it properties close to those of 585-thousandths gold wire. It does not fear water: showering, swimming, and the beach are all possible, with the only precaution being to remove it during intense physical activity, to preserve the delicacy of the handcrafted wire. Its lifespan is measured in decades.

18k gold, for its part, is a solid gold wire at 75%, throughout its thickness, with no underlying metal base. Its care is just as simple: lukewarm water, mild soap, drying with a soft cloth, with no special precaution needed.

The difference between the two materials, then, does not come down to everyday durability, but to the nature of the wire's construction and, for many customers, to the heirloom value of solid gold. Gold-filled only exists in yellow and rose; 18k gold adds white to that.

For a first personalized piece worn every day, yellow or rose gold-filled from the 14k gold-filled collection remains a sound choice. For a piece meant as a piece to pass down, 18k gold is the natural choice. We cover this comparison in more depth in our article 18k Gold: What This Number Really Changes for Your Jewelry.

Personalizing a Piece in 18k Gold: Words, Names, and Initials

18k gold accommodates the same personalization options as the atelier's other materials. The handcrafted word allows a name or short word to be shaped, in lowercase, with no accents or apostrophes, with the letter "J" in uppercase when it opens the word. The initial, for its part, carries one or several letters referring to one or several names, handcrafted in uppercase on the Capital and Capital Initial models.

The Original Mantra Necklace, available in rose 18k gold, accommodates a short phrase or up to five names on a single wire. For a ring in 18k gold, three models exist: the Original Personalized Ring with up to five letters, the Original Initial Ring, and the Capital Initial Ring, in sizes 48 to 62.

In Paris, two options are available to customers in a hurry: coming to have their piece personalized directly at the atelier in about thirty minutes, or having it delivered by courier the same day. For remote orders, the piece is shipped within 1 to 3 working days, then delivered in France in 1 to 3 working days after shipping.

Each piece is presented in a case, with no pouch or separate certificate. A piece handcrafted to order with a chosen word cannot be exchanged or refunded; a non-personalized piece can.