Platinum
Platinum is a naturally white, dense, and exceptionally durable metal. It is the premium choice for diamond jewellery, particularly for engagement rings and fine jewellery intended to last decades without significant maintenance.
Platinum is naturally white all the way through. Unlike white gold, which is an alloy of yellow gold and white metals coated with rhodium to appear white, platinum's white colour comes from the metal itself. It does not require plating and cannot develop a yellow cast from plating wear. A platinum ring worn for twenty years will have the same white colour throughout as the day it was made.
Platinum does develop a patina: fine surface scratches from daily wear create a soft, matte sheen over time. This patina is called the "platinum bloom" and many wearers come to love it as a sign of genuine wear and history. Platinum can be polished back to a bright finish at any time by a jeweller, but many wearers choose to leave the patina. This is entirely different from the yellow cast that develops in white gold when rhodium wears through.
Platinum is denser than gold: a platinum ring weighs approximately 60 percent more than an equivalent yellow gold ring of the same size and thickness. This gives platinum a distinctive substantial feel. Platinum is also harder to work than gold, which means platinum jewellery fabrication requires more skilled labour, contributing to its higher cost.
Platinum is hypoallergenic. Nickel allergies are common, and 18kt white gold alloys often use nickel as a whitening agent (though some use palladium instead). Platinum contains no nickel and is safe for consumers with metal sensitivities.
Pricing: platinum is typically 20 to 40 percent more expensive than 18kt gold for an equivalent ring, depending on market metal prices and the complexity of fabrication. The premium is justified by the long-term maintenance savings (no replating) and by platinum's superior durability for prong settings.
18kt white gold
White gold is an alloy of yellow gold with white metals, typically palladium, nickel, or a combination, that gives the alloy a paler colour than pure yellow gold. The resulting alloy is still slightly yellowish rather than the bright white of platinum, which is why white gold is finished with a rhodium plating to achieve the bright white appearance consumers associate with the metal.
18kt white gold contains 75 percent gold and 25 percent other metals. The 75 percent gold content is what the 18-karat designation refers to (18 parts gold out of 24 parts total). The other 25 percent is the alloy metals that provide the white colour and the hardness required for jewellery fabrication.
White gold is less expensive than platinum for the same ring design, reflecting lower material cost and slightly easier workability. For buyers who want the bright white appearance associated with platinum at lower cost, 18kt white gold is a valid option, provided the rhodium replating requirement is understood and accepted.
Rhodium plating: what it is and what it costs
Rhodium is a platinum-group metal that is even brighter white than platinum. Rhodium plating deposits a thin layer (typically 0.5 to 1 micron thick) of rhodium onto the white gold surface, giving it a bright, mirror-white finish. The plating is real rhodium, not a paint or lacquer, and it provides genuine hardness and brightness.
The problem is thickness. A 1-micron layer of rhodium is extremely thin. Daily wear, particularly on rings that contact surfaces frequently, removes this thin layer over time. The timescale depends on the piece and the wearer's activities: for a ring worn every day by someone who works with their hands, the plating may wear noticeably within 12 to 18 months. For a necklace or earrings with less physical contact, the plating may last 3 to 5 years before any visible difference appears.
Replating is a routine jewellery service. Most jewellers charge Rs 500 to Rs 2,000 for replating a ring, depending on complexity. The process involves cleaning the piece, polishing any scratches, and applying fresh rhodium in a plating bath. The ring comes out looking new. Over decades of wearing, this cost is real but manageable.
The key point: any consumer who is told "this is white gold, it is exactly like platinum" without being informed of the rhodium plating and its maintenance requirement has been incompletely informed. The metals are not equivalent in maintenance, regardless of their similar appearance when new.
18kt yellow gold
Yellow gold has been the primary metal for Indian jewellery for thousands of years and remains culturally dominant for diamond jewellery across many Indian contexts. 18kt yellow gold contains 75 percent gold and 25 percent alloy metals, typically copper and silver, which give it the characteristic warm yellow colour and the hardness necessary for jewellery fabrication.
18kt yellow gold requires no plating and its colour is stable over time. It develops surface scratches with wear, which can be polished away at a jewellery service. It does not change colour or require any surface treatment to maintain its appearance.
The warm colour of yellow gold interacts with diamond colour in a specific way: the yellow metal reflects warm light onto the underside of the stone, which can make slightly tinted diamonds (H, I, J colour) appear more attractive than they would in white metal settings. This is why lower-colour diamonds are often better suited to yellow gold: the metal disguises warmth rather than contrasting with it. Conversely, D–F colour diamonds lose some of their visual colourlessness in yellow gold because the warm reflection reduces the contrast that makes colourlessness apparent.
Yellow gold is the most appropriate metal for traditional Indian diamond jewellery forms (bangles, traditional necklaces, bridal sets) because it aligns with the cultural context in which these pieces are worn and complements the warm aesthetic of traditional Indian design.
18kt rose gold
Rose gold is an alloy of gold and copper that produces a warm pink colour. The standard for fine jewellery is 18kt rose gold, containing 75 percent gold and 25 percent copper and other alloy metals. The exact shade of rose varies: higher copper content produces a deeper rose or "red gold" hue; less copper produces a softer pink.
Rose gold has grown sharply in popularity since approximately 2012 and has become particularly popular for engagement rings and fashion jewellery in India. Its warm, feminine character and distinctive colour make it visually recognisable and different from the more traditional gold and white gold options.
Rose gold does not require plating. Its colour comes from the copper content of the alloy, not from a surface treatment, and is stable over time. However, rose gold does develop a different kind of change: the copper in the alloy can oxidise very slightly over years of wearing, darkening the colour marginally. This darkening is subtle and many wearers find it adds character rather than diminishing the piece's appearance. The oxidisation can be addressed by polishing if preferred.
Rose gold is slightly harder than yellow gold due to the copper content, making it more resistant to surface scratching. Its hardness is similar to 18kt white gold alloys. For diamond prong settings, rose gold's hardness is adequate and its appearance in combination with certain diamond shapes (oval, pear, cushion, heart) is particularly compelling.
The 22kt problem in India
India's traditional jewellery market predominantly uses 22kt gold (91.7 percent pure gold). This very high gold content gives traditional Indian jewellery its distinctive warm, deep yellow colour and satisfies the cultural expectation for high-purity gold. However, 22kt gold is too soft for precision diamond settings.
The problem is structural. A prong setting holding a diamond must resist the bending and wear forces of daily use without deforming. The higher the gold content, the softer the metal. 22kt gold prongs can deform over time, allowing a diamond to shift in its setting or eventually be lost. 18kt gold alloys are meaningfully harder than 22kt because the 25 percent alloy content specifically includes harder metals for this purpose.
Diamond jewellery sold in India is correctly made in 18kt gold. Any diamond piece in 22kt gold is either: using unusually heavy prongs and settings to compensate for the softer metal, using paste or low-quality stones where loss is not a significant concern, or is inappropriately set regardless of the seller's assurance. For any piece of diamond jewellery where the stone matters, insist on 18kt gold settings and verify the hallmark.
BIS hallmarking in India distinguishes 18kt (marked 750) from 22kt (marked 916 or 91.6) and from other purities. Always check the BIS hallmark on diamond jewellery to confirm you are buying 18kt and not 22kt gold.
How metal colour affects diamond appearance
The metal colour of a ring or piece of jewellery directly affects how the diamond's colour appears, because light reflected from the metal surface reaches the diamond's underside and contributes to the overall visual character of the stone.
White metal (platinum or white gold) reflects cool, neutral light onto the diamond. This maximises the visual impact of colourless diamonds (D–G colour) by providing no competing colour. Any warmth in the diamond is also slightly enhanced by contrast with the white metal, which is why G–H colour diamonds can look slightly more tinted in white metal than they would against warm metal.
Yellow and rose gold reflect warm light onto the diamond. This warms the stone's appearance, which can benefit lower-colour diamonds (H–K) by blending their natural tint with the metal's warmth. The same I colour diamond that looks slightly tinted in white gold looks harmoniously warm in yellow gold.
The practical guidance: choose white metal (platinum or white gold) for D–H colour diamonds to maximise the colourlessness. Choose yellow or rose gold for H–K colour diamonds to harmonise the stone's natural warmth with the metal. H colour is the pivot grade that works well in both contexts.
Full metal comparison
| Metal | Colour | Maintenance | Relative cost | Best for |
|---|---|---|---|---|
| Platinum | Bright white, develops patina | None required. Polish periodically if preferred. | Highest | Long-term heirloom pieces, D–H colour diamonds, buyers with metal sensitivity |
| 18kt white gold | Bright white (rhodium-plated) | Rhodium replating every 1–3 years (Rs 500–2,000) | Medium-high | D–H colour diamonds, buyers who want white look at lower cost than platinum |
| 18kt yellow gold | Warm yellow | Minimal. Polish periodically. | Medium | H–K colour diamonds, traditional Indian designs, yellow gold cultural preference |
| 18kt rose gold | Warm pink | Minimal. Very slight copper oxidation over years. | Medium | G–J colour diamonds, romantic/contemporary aesthetic, oval/pear/cushion shapes |
| 22kt yellow gold | Deep warm yellow | Minimal. Polish periodically. | High (high gold content) | Traditional Indian jewellery WITHOUT precision diamond settings. NOT recommended for prong-set diamond rings. |
India-specific considerations
India's metal market for jewellery is dominated by gold, and the cultural preference for gold in jewellery runs deep. Diamond jewellery in India sits at the intersection of this gold tradition and the newer diamond tradition, producing combinations (yellow gold with diamonds) that are common in India but less standard in Western fine jewellery.
Making charges in India vary by metal. Platinum has higher making charges than gold because of the more specialised labour required for platinum fabrication. 18kt white gold making charges are similar to yellow gold making charges. The making charge for a piece is a significant component of the total price, particularly for elaborate designs.
Metal sourcing and hallmarking: BIS hallmarking ensures the metal's purity is what is stated. The 750 hallmark on 18kt gold jewellery and the 950 hallmark on platinum jewellery are the relevant marks to verify. Always check the BIS hallmark on diamond jewellery in India. The hallmark does not verify the diamond quality, only the metal purity.
Frequently asked questions
How often does white gold need to be replated?
The replating interval depends on the piece and the wearer's lifestyle. For a ring worn every day by an active person, noticeable yellowing of the rhodium plating typically begins within 12 to 18 months. For a necklace or earrings with less physical contact, the plating may last 3 to 5 years. A piece that is only worn occasionally for special events may never show noticeable wear during the owner's lifetime. Have the piece inspected and replated when any yellowing is visible. The cost is minimal and the result is a piece that looks new again.
Is platinum worth the extra cost over white gold?
The answer depends on your priorities and time horizon. If you plan to wear the piece daily for decades and want zero maintenance for the metal colour, platinum is worth it. If you are comfortable with periodic replating at low cost and prefer to save on the initial purchase, 18kt white gold is a valid alternative. For an engagement ring intended to be worn every day for 30 to 50 years, the lifetime maintenance cost of white gold replating (perhaps Rs 1,000 every 2 years = Rs 25,000 over 50 years) is real but not overwhelming. For the highest value diamond in a setting where the prong security matters most, platinum's combination of durability and colour stability justifies the premium.
Can I mix metals in jewellery?
Yes, and mixed metal jewellery has become more common and more accepted. A yellow gold ring worn alongside a white gold or platinum ring is a common stacking combination. Mixing metals in a single piece (a ring with both yellow and white gold components) is also a legitimate design choice. The one practical consideration is that different metals scratch differently: platinum is denser than gold, and if a platinum ring rubs against a yellow gold ring, the gold ring will scratch more readily than the platinum. This is not a reason to avoid mixing metals, just an awareness of what to expect with daily wear.
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