Question 1

What exactly is sterling silver and why is it 92.5% pure?

Accepted Answer

Sterling silver is an alloy composed of 92.5% pure silver and 7.5% other metals, almost always copper. The 925 ratio was established by law in England in 1300 under King Edward I and has remained the international standard for over 700 years. Pure silver (999 fineness) is beautiful but extremely soft — it scratches, dents, and bends with minimal pressure, making it impractical for functional items. Adding 7.5% copper hardens the metal dramatically while preserving silver's signature bright white luster, antimicrobial properties, and excellent conductivity. The result is a metal durable enough for daily-wear jewelry, flatware, and decorative objects while maintaining the precious metal status that makes it valuable. The 925 stamp (or equivalent marks like STER, Sterling, SS) is legally required on sterling silver in the US, UK, Canada, and most of Europe. The KaratWorth Sterling Silver Calculator uses the fixed 0.925 purity factor to compute exact melt value for any weight of sterling silver.

Question 2

How do I verify if an item is genuine sterling silver or just plated?

Accepted Answer

Verifying sterling silver requires examining multiple indicators. First, inspect for stamps: genuine sterling will bear '925', 'STER', 'STERLING', 'SS', or a maker's mark combined with a purity indicator. Silver-plated items may show 'EPNS' (electroplated nickel silver), 'EP' (electroplate), 'SILVER PLATE', 'A1', or 'QUADRUPLE PLATE'. Second, perform the magnet test: silver is not magnetic, so if a strong magnet sticks firmly, the piece contains ferrous metal and is not solid sterling. Third, check the weight: sterling silver has a distinctive heavy, cool feel. Plated items on brass or copper bases feel lighter and warmer. Fourth, examine wear points: on plated items, the base metal (often brassy yellow or coppery red) shows through at edges and high-contact areas. Fifth, the acid test is definitive: apply silver testing solution to a hidden area — sterling turns dark red or brown, while plated items show green, blue, or no reaction. For valuable pieces, professional XRF testing at a jeweler provides conclusive results in seconds.

Question 3

Is sterling silver valuable enough to sell, and what is a fair payout?

Accepted Answer

Yes, sterling silver has genuine precious metal value, though it is significantly less valuable per gram than gold. At a silver spot price of $25 per troy ounce, 100 grams of sterling silver contains 92.5 grams of pure silver worth approximately $74. A heavy sterling silver flatware set weighing 2,000 grams could have a melt value of nearly $1,500. The key factor is weight — silver value scales linearly with weight, unlike gold where even small pieces have meaningful value. For scrap sterling, reputable buyers typically offer 70-85% of melt value. Pawn shops may offer 60-75%, while specialized silver refiners might pay 80-90% for large lots. Antique or designer sterling from makers like Tiffany, Georg Jensen, Wallace, or Gorham can be worth far more than melt — a Tiffany sterling bowl might sell for $500+ even if its melt value is only $150. The rule: if the piece is damaged, unmarked, or mass-produced, sell for scrap; if it bears a prestigious maker's mark, consult an antique dealer before scrapping.

Question 4

What is the difference between sterling silver, Britannia silver, and Mexican silver?

Accepted Answer

These three standards reflect different historical traditions with varying silver content. Sterling silver (925) is the global standard at 92.5% pure, hard enough for everyday use while maintaining high silver content. Britannia silver (958) is the higher British standard at 95.8% pure — it has a brighter, whiter appearance than sterling but is softer and more prone to scratching, making it suitable for display pieces and commemorative items rather than daily wear. Mexican silver (950) contains 95% pure silver and was the legal standard in Mexico until the 1980s. It is slightly softer than sterling and prized for its warm, luminous color. Taxco, Mexico became world-famous for 950 silver jewelry and hollowware in the mid-20th century. Each standard has a different melt value multiplier: Britannia at 0.958, Mexican at 0.950, and sterling at 0.925. The KaratWorth Sterling Silver Calculator is set to 0.925, but the general Silver Calculator lets you select any custom purity for these alternative standards.

Question 5

Why does sterling silver tarnish and how does it affect value?

Accepted Answer

Sterling silver tarnishes because the copper in the alloy reacts with sulfur compounds in the air, forming silver sulfide — the dark, sometimes black coating seen on old silver. This is a surface chemical reaction and does not damage the underlying metal. Tarnish has no effect whatsoever on melt value because refining removes all surface contamination. However, heavy tarnish can obscure maker's marks and hallmarks, making it harder to identify collectible pieces. When selling sterling for scrap, tarnish is irrelevant — refiners melt and purify regardless of surface condition. When selling collectible pieces, light tarnish is often preferred by collectors who value the authentic aged patina, while aggressively polished antique silver may actually lose value. To prevent tarnish, store sterling in anti-tarnish bags or cloth, keep pieces away from rubber, wool, and household chemicals, and wear jewelry regularly since skin oils can actually slow tarnishing. For melt value calculations, never clean with abrasive methods that remove metal — tarnish is superficial, but abrasive cleaning removes actual silver weight.

Question 6

What types of sterling silver items have the highest melt value?

Accepted Answer

The sterling silver items with the highest melt value are those with substantial weight and minimal non-silver components. Tea sets and coffee services (typically 1,000-3,000 grams total) have enormous melt value — a 2,000-gram service at current prices could be worth $1,400-2,000 in melt alone. Candelabras and centerpieces are similarly heavy. Flatware sets vary widely: a full 12-place setting with serving pieces might weigh 1,500-2,500 grams, while individual pieces like serving spoons weigh 50-100 grams. Heavy chains and bracelets (50-150 grams) have significant silver value. Picture frames, bowls, and vases can be surprisingly heavy if they are solid rather than weighted. Items with minimal value include: thin chains (under 5 grams), small earrings (under 3 grams each), items marked 'WEIGHTED' or 'REINFORCED' (which contain cement or wax cores), and silver-plated items (negligible silver content). When evaluating a collection, weigh the heaviest pieces first — they contribute disproportionately to total value. The KaratWorth Sterling Silver Calculator makes it easy to assess each piece's melt value by simply entering its weight.

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