Fine Jewellery Materials Guide: Gold, Silver, Platinum, Diamonds & Gemstones

Whether you're shopping for an engagement ring, starting a solid-gold collection, or choosing an everyday piece you'll actually keep, understanding fine jewellery materials is essential. This comprehensive guide covers every precious metal, natural gemstone, and real pearl we work with at Vanhess Jewellery — with durability scores, allergen ratings, real-world value, and the red flags that separate fine jewellery from costume.

1. Precious Metals

Fine jewellery is defined first and foremost by its metal. Only four metals are considered truly "precious" in the jewellery trade: gold, silver, platinum, and palladium. Everything else — "gold-tone", "gold-filled", "gold-plated", "alloy", "vermeil" — is a lesser approximation. Here's what you actually need to know about each.

14k Solid Gold

14k is the sweet spot of fine jewellery — 58.5% pure gold mixed with stronger alloy metals (copper, silver, zinc). It's harder and more durable than 18k, making it the best choice for daily-wear pieces that see a lot of life: wedding bands, everyday stud earrings, chains for everyday wear, and engagement rings for people with active hands. Hallmarked as 14K or 585. Never tarnishes. Skin-safe for the vast majority of people. Expect to pay roughly $180–$220 in raw gold alone for a 5-gram piece. Our full 14k vs 18k guide breaks it down further.

18k Solid Gold

18k is 75% pure gold — a richer, warmer colour and the metal of choice for heirloom and statement pieces. It's softer than 14k (scratches more easily), so it's less ideal for daily wear on active hands, but for pendants, earrings, cocktail rings, and special-occasion pieces it looks more luxurious and contains 28% more actual gold. Hallmarked as 18K or 750. Even more skin-safe than 14k because there's less alloy metal.

Yellow, White & Rose Gold

All three are real solid gold — the difference is the alloy metals mixed with the pure gold: copper for rose, palladium or nickel for white, a balanced mix of silver and copper for yellow. White gold is almost always rhodium-plated to give it a crisp bright-white finish; that rhodium layer wears off every 1–3 years and needs re-plating (we offer this in-house — see our repair service). All three are valued by karat, not colour, so 14k yellow and 14k rose cost essentially the same.

Sterling Silver (.925)

Sterling silver is 92.5% pure silver + 7.5% alloy (usually copper) for strength. Hallmarked .925 or STER. It's the most accessible true precious metal — a real sterling silver pendant or pair of earrings from our sterling silver collection costs a fraction of solid gold but still holds value for decades. It does tarnish (unlike gold) — a dark film of silver sulfide that builds up in still air. Proper storage and regular polishing prevent this; see our care guide.

Platinum (PT950)

Platinum is the densest, purest, and most durable of the precious metals — 95% platinum with 5% alloy (typically ruthenium or iridium). Hallmarked PT950 or PLAT. It's naturally white (no plating needed, no yellowing over time), hypoallergenic, and holds diamond settings more securely than any other metal — which is why it's the go-to for heirloom-grade engagement rings. Expect it to cost roughly 2× the equivalent 14k gold piece because platinum is both rarer and denser (a platinum ring uses more metal by weight than an identical-sized gold ring).

Gold-Filled vs. Gold-Plated vs. Vermeil (Why None of These Are Solid Gold)

You'll see these terms everywhere — and they're often used deceptively. Here's the truth:

• Gold-filled: a thick layer of real gold (at least 5% of the total weight) mechanically bonded to a brass core. Lasts many years, doesn't flake. Still not solid gold.
• Gold vermeil: sterling silver coated in a thick layer of gold (at least 2.5 microns). Better than plating, but the gold layer will still eventually wear through on high-friction areas.
• Gold-plated: a thin layer of gold (typically under 1 micron) electroplated onto base metal. Wears off in months with regular wear.
• Gold-tone / gold-coloured: marketing language for no gold at all. Avoid.

At Vanhess we sell solid 14k, 18k, sterling silver, and platinum only — never plated pieces. Our solid gold guide explains all of this with visual examples.

2. Allergen Safety Guide

Nickel Allergy: The Most Common Metal Allergy

About 10–20% of adults (and a higher percentage of women) have a contact allergy to nickel. Symptoms range from mild itching and redness to persistent eczema-like rashes. Fashion jewellery, plated pieces, and cheap base-metal findings are the most common culprits — often causing people to assume they can't wear jewellery at all, when in reality they just can't wear that jewellery.

Which Fine Jewellery Metals Contain Nickel?

• 14k yellow gold: tiny amount — safe for nearly everyone, but hyper-sensitive individuals may react.
• 14k white gold: traditionally contained nickel as the whitening alloy — modern Canadian-made 14k white gold typically uses palladium instead (nickel-free). Ours does.
• 18k gold: higher purity = less alloy = much safer for allergic skin.
• Sterling silver: the alloy is copper, not nickel. Safe for nickel-allergic skin.
• Platinum: no nickel, no issues. The safest metal on the market.

Safest Metals for Sensitive Skin

In order from most hypoallergenic: platinum → 18k gold (any colour) → 14k yellow gold → palladium-alloyed 14k white gold → sterling silver. If you've reacted to "gold" jewellery in the past, it was almost certainly plated or low-karat costume metal — not real solid gold. Book a free consultation and we'll help you find something you can actually wear.

Why Piercings Need Extra Care

For fresh or healing piercings, only implant-grade titanium, niobium, or solid 14k/18k gold should touch the wound. Plated pieces leach metal ions into broken skin and can trigger lifelong allergies in people who weren't previously allergic. Our solid-gold piercing collection is specifically designed for healed piercings — and we sell it at prices designed to make upgrading from cheap stainless accessible.

3. Diamonds

The 4Cs

Every natural diamond is graded on four factors — the 4Cs:

• Cut: how well the diamond was shaped and faceted. Graded Excellent → Poor. Cut is the single biggest driver of sparkle, and the one variable most under the jeweller's control. Never compromise on cut.
• Colour: graded D (colourless) through Z (noticeably yellow). D–F are "colourless", G–J are "near-colourless" and a great value sweet spot. Most buyers can't tell the difference between D and H, but there's a massive price jump.
• Clarity: graded FL (flawless) through I3 (very included). VS1–VS2 are "eye-clean" — any inclusions are invisible without magnification. That's usually the right target.
• Carat: the stone's weight, not size. A well-cut 0.90ct can look as big as a poorly-cut 1.00ct, and cost substantially less. There are strategic carat weights to shop just under (0.90, 1.40, 1.90) for big price breaks.

Our full diamond guide goes much deeper, including diamond cut shapes and trade-offs between them.

Natural vs. Lab-Grown Diamonds

Lab-grown diamonds are chemically, optically, and physically identical to natural diamonds — they just formed in a lab over weeks instead of in the earth over billions of years. They cost 30–60% less for the same quality. Natural diamonds retain better long-term value and carry more traditional significance; lab-grown diamonds let you get noticeably more size or quality for the same budget. There's no "right" answer — it depends on what you value. We sell both and will tell you which makes more sense for your situation.

Diamond Certification

Any diamond above about 0.25ct should come with a grading report from a trusted lab — GIA (Gemological Institute of America) is the gold standard; AGS (American Gem Society) and IGI are also respected. The report lists the 4Cs along with measurements and a plot of inclusions. Never buy a significant diamond without one. Certificates from the seller's own "lab" are worthless.

4. Coloured Gemstones

Natural vs. Lab-Grown vs. Simulant

Three very different things:

• Natural: mined, formed by geological processes. Each stone is unique.
• Lab-grown (synthetic): same chemical composition as natural, grown in controlled conditions. Usually 50–80% cheaper than natural of equal quality. Still a "real" ruby/sapphire/etc.
• Simulant: a different material that looks like the gem — cubic zirconia simulating diamond, glass simulating ruby. Not the same material at all. Essentially costume.

The Precious Four

Sapphire (Mohs 9) — most commonly blue but available in every colour except red. Extremely durable; excellent for daily-wear rings and earrings. September birthstone. Ruby (Mohs 9) — the red variety of corundum, the same mineral as sapphire. Classic romantic stone. July birthstone. Emerald (Mohs 7.5–8) — prized green beryl, but almost always oil-treated to fill natural inclusions. Handle with care — no ultrasonic cleaning. May birthstone. Diamond (Mohs 10) — covered above. April birthstone.

Semi-Precious Gemstones

"Semi-precious" is an old trade term — some of these stones are rarer and more beautiful than the "precious" four. Popular examples used in fine jewellery include tanzanite (only mined in one area of Tanzania — increasingly rare), aquamarine, morganite, tourmaline, garnet, amethyst, citrine, topaz, peridot, and opal. Our gemstone guide covers each in detail.

The Mohs Hardness Scale and Wearability

Rule of thumb: for rings worn daily, stay at Mohs 7 or higher. For pendants and earrings, anything Mohs 5+ works. Below Mohs 5, reserve for occasional wear.

Treatments and Enhancements

Nearly all coloured gemstones on the market are treated in some way — heat treatment (standard and permanent for sapphires and rubies), oil or resin filling (standard for emeralds), irradiation (common for blue topaz). Treatments are not deceptive if disclosed. A reputable jeweller lists treatments on the invoice. We always do.

5. Pearls

Freshwater, Akoya, Tahitian & South Sea

Freshwater pearls — the most accessible; our freshwater pearl collection is a great starting point. Sizes 4–12mm, irregular shapes, wide colour variation (white, pink, peach, lavender, black).

Akoya pearls — traditional white/cream Japanese saltwater pearls, rounder and more uniform than freshwater, higher lustre. Sizes 6–9mm typical.

Tahitian black pearls — naturally dark pearls from French Polynesian black-lipped oysters; iridescent peacock-green, silver, or true black. Sizes 8–14mm.

South Sea pearls — the rarest and largest; 9–16mm; white, gold, silver. Premium pricing.

Pearl Quality Grading

Pearls are graded on five factors: lustre (how mirror-like is the surface?), surface (free of spots and dips?), shape (perfectly round is most valuable; baroque is artistic), colour, and size. AAA is the highest commercial grade. Look at each pearl in the piece — matched sets of high-quality pearls are rarer and cost disproportionately more than individual high-quality pearls.

6. Fine Jewellery Materials at a Glance

7. Frequently Asked Questions