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How to Buy a Diamond Tax-Free in Grand Cayman: The Complete Visitor’s Guide
Everything you need to know about buying a GIA-certified diamond tax-free in Grand Cayman — how much you save, what to look for, and
A magnificent piece of fine jewellery is one of the most lasting investments you can make — not just financially, but emotionally. The diamond engagement ring you wear every day, the sapphire necklace passed down through generations, the tennis bracelet you treasure from a milestone anniversary — these pieces carry enormous significance. Yet their longevity depends not just on the quality of their creation, but on how thoughtfully they are cared for over the years. At IDC Cayman, Grand Cayman’s leading destination for GIA-certified diamonds and fine jewellery, we are committed not only to helping you find the perfect piece, but to ensuring it remains as beautiful decades from now as it is the day you acquire it. This complete expert guide to fine jewellery care covers everything you need to know.
Effective jewellery care begins with understanding what your pieces are made of. Fine jewellery combines precious metals, diamonds, and coloured gemstones — each with distinct properties, hardnesses, and care requirements. What is perfectly safe for a diamond may damage an emerald; what works for platinum may be wrong for rose gold. Knowing your materials is the essential foundation of proper care.
Diamonds are the hardest natural substance on earth, rating 10 on the Mohs hardness scale. This means no mineral can scratch a diamond — only another diamond can. This extraordinary hardness makes diamonds highly resistant to scratching and abrasion, which is why they are so practical for jewellery worn daily. However, hardness is not the same as toughness. Diamonds can chip or cleave if struck sharply at the right angle, particularly at the thin points of fancy shapes like marquise, pear, and heart cuts. Diamond is also not scratch-proof when it comes to the foil-like surface at the girdle of some cuts — care should be taken not to bang diamond jewellery against hard surfaces unnecessarily.
The precious metals used in fine jewellery each have different properties. Platinum (typically 95% pure in jewellery) is the most durable, developing a natural patina over time rather than losing metal — the surface develops a warm, satin-like sheen that many wearers love. Yellow gold (18ct = 75% gold with 25% alloy metals) is relatively soft compared to platinum and can scratch over time, but maintains its colour permanently. White gold is yellow gold alloyed with white metals and plated with rhodium — the plating can wear off over time, exposing the slightly yellowish gold underneath, and requires periodic re-plating. Rose gold (18ct, alloyed with copper) is slightly harder than yellow or white gold due to its copper content and tends to wear well. All gold alloys can be scratched, dented, and bent if subjected to sufficient force, particularly at thinner shanks.
Coloured gemstones vary enormously in hardness and durability. Rubies and sapphires (both forms of corundum) rate 9 on the Mohs scale — nearly as hard as diamonds and extremely durable for jewellery use. Emeralds rate 7.5–8 but are typically heavily included and therefore considerably more fragile than their hardness suggests — they can crack or chip more easily than rubies or sapphires. Aquamarine and topaz rate 7.5–8 and are generally durable but should be protected from sharp impacts. Pearls and opals are much softer (2.5–3 and 5.5–6.5 respectively) and require especially gentle care. Many coloured stones are treated with oils, resins, or heat to enhance their colour or clarity — treatments that require specific care to preserve.
The way you wear your jewellery day to day has a profound impact on its longevity. Many of the most common causes of damage to fine jewellery are completely avoidable with a few simple habits.
Remove jewellery before physical activities. Rings, bracelets, and necklaces should be removed before exercise, sports, gardening, heavy lifting, or any activity that could subject them to impact, abrasion, or excessive sweating. Even a light workout at the gym — gripping bars, lifting weights — can deform or scratch ring shanks and chip stones. Gardening exposes jewellery to soil, fertilisers, and tools, all of which can scratch, stain, and erode precious metals and stones. Swimming in chlorinated pools or hot tubs is particularly damaging — chlorine reacts with gold alloys, weakening the metal over time and potentially causing embrittlement that leads to setting failures.
Remove jewellery before cleaning and household tasks. Household cleaning products — bleach, ammonia-based cleaners, oven cleaners, drain cleaners — contain chemicals that can damage precious metals and gemstones. Even rubber gloves may contain sulphur compounds that tarnish silver and attack some gold alloys. When washing dishes, the combination of hot water, detergent, and impact on hard surfaces (glass, ceramic) is a common cause of stone chipping and setting loosening. Make it a habit to remove rings before any household cleaning task.
Remove jewellery before applying cosmetics, hairspray, and perfume. Hair products, perfumes, and lotions are among the most insidious threats to fine jewellery. Hairspray in particular coats diamond surfaces with a filmy residue that dramatically reduces brilliance — what looks like a dull diamond is often simply a dirty one. Perfumes and body lotions can discolour some metals and degrade the surfaces of softer gemstones like pearls. The rule is simple: put your jewellery on last, after all cosmetics and grooming products have been applied and dried.
Remove jewellery before sleeping. Many people wear their engagement ring around the clock, but sleeping in jewellery — particularly rings with high settings or delicate prongs — carries real risks. Prongs can catch on bedding and be bent or broken. High-set stones can be knocked against the bedframe. Rings can be difficult to remove from a finger that has swollen slightly during sleep. Developing a habit of placing your ring and other fine jewellery in a safe dish or box before bed significantly reduces these risks.
Be aware of temperature extremes. Sudden temperature changes can stress some gemstones, particularly those with inclusions or natural fractures. Wearing jewellery in saunas, extremely hot baths, or very cold environments can cause thermal shock in vulnerable stones. Pearls are particularly sensitive to temperature and humidity changes, which is why pearl necklaces stored in very dry environments (or exposed to air conditioning) can dry out and crack.
Regular cleaning is essential to maintaining your diamond jewellery’s brilliance. Diamonds attract grease — the natural oils from your skin, hand lotion, cosmetics, and cooking fat all accumulate on the stone’s surface, coating the facets and dramatically reducing the amount of light that enters and exits the stone. A clean diamond sparkles; a grimy diamond looks dull and flat.
The most effective home cleaning method for diamond jewellery is also one of the simplest: warm water with a small amount of gentle liquid dish soap. Fill a small bowl with warm (not hot) water and add a few drops of mild liquid dish soap. Place your diamond jewellery in the solution and allow it to soak for 20–30 minutes. The soaking loosens grease and dirt from behind the stones and in the crevices of the setting. After soaking, use a very soft toothbrush (a baby toothbrush works well) to gently scrub the stone and setting from all angles, paying particular attention to the underside of the setting where oil and grime accumulate most heavily. Rinse thoroughly under warm running water (make sure the drain is closed or use a bowl for rinsing — small stones can travel far down a drain), then pat dry with a soft, lint-free cloth.
Commercial ultrasonic cleaners — devices that use high-frequency sound waves in a cleaning solution to remove dirt — are extremely effective for diamond jewellery in good condition. Most jewellery stores use ultrasonic cleaners for their professional cleaning services. Smaller versions are available for home use at modest prices. However, ultrasonic cleaning is not appropriate for all jewellery — it should not be used on pieces with fracture-filled or clarity-enhanced diamonds, on pieces with loose settings, or on any jewellery containing soft or porous gemstones (emeralds, pearls, opals, turquoise, coral). If in doubt, avoid the ultrasonic cleaner and use the soap-and-water method instead.
Steam cleaners are another professional option, highly effective at removing grease and cleaning hard-to-reach areas around settings. Like ultrasonic cleaners, they are not appropriate for all stones — heat and pressure can damage treated or heat-sensitive gemstones. Always check with a qualified jeweller before using a steam cleaner on unfamiliar pieces.
As the most frequently worn pieces of jewellery for most people, engagement rings and wedding bands receive more daily wear — and therefore more care attention — than any other jewellery. Clean your engagement ring at home weekly using the soap-and-water method, and bring it to IDC Cayman for a professional clean and inspection every six to twelve months. Professional inspection is critical: a qualified jeweller will examine the prongs for wear and bending, check for any looseness in the stone setting, look for signs of metal fatigue or cracking, and attend to any issues before they become serious problems. A loose prong is easily retipped; a lost diamond is not easily replaced. Regular inspection is the most important maintenance investment you can make for your engagement ring.
Pearls are among the most delicate of fine jewellery materials, requiring care quite different from diamonds and hard gemstones. The nacre (the iridescent outer layer of the pearl) can be damaged by acids, chemicals, and abrasives. Never clean pearls with ultrasonic cleaners, steam cleaners, or any commercial jewellery cleaning solutions. Instead, wipe pearls gently with a soft, damp cloth after each wearing to remove body oils and cosmetic residue. Allow them to dry completely before storing, as the silk thread used in pearl strands can stretch and weaken when wet. Pearl necklaces should be restrung every two to three years by a professional stringer — old silk threads break, and a broken strand can mean losing valuable individual pearls. Store pearls separately from other jewellery to prevent harder stones from scratching the soft nacre surface.
Emeralds require special care because virtually all natural emeralds are fracture-filled with cedar oil or resin to improve their apparent clarity — a standard and accepted treatment in the gem trade. This filling can be degraded by ultrasonic cleaners, steam, harsh chemicals, and prolonged soaking. Clean emerald jewellery with a soft, damp cloth only — no soaking, no ultrasonic, no steam. If an emerald appears to have lost some of its lustre over years of wear, it may need to be re-oiled, a professional treatment available from gemologists. Never use abrasive materials of any kind on emeralds, as the stone’s natural inclusions make it vulnerable to chipping and surface damage.
Sapphires and rubies are among the most durable of coloured gemstones and can generally be cleaned with the same soap-and-water method as diamonds. Ultrasonic cleaning is typically safe for untreated or heat-treated sapphires and rubies, but should be avoided for stones that have been fracture-filled or beryllium-treated (treatments that can be detected by a gemologist). Check your GIA or laboratory certificate for treatment information before using ultrasonic or steam cleaning on any coloured stone.
White gold jewellery with rhodium plating will eventually show signs of wear at the areas of highest contact (the inside of ring shanks, the back of pendant bails). When the rhodium plating wears through, the warm yellowish colour of the gold underneath becomes visible. Rhodium re-plating is a straightforward professional service that restores the bright white appearance immediately. Depending on skin chemistry and wear patterns, re-plating may be needed every one to three years for frequently worn pieces. Platinum does not need plating — it naturally maintains its white colour — but it does develop a patina (a softer, slightly matte surface texture) from fine scratches accumulated over daily wear. If you prefer the mirror-bright finish of new platinum, your jeweller can re-polish the piece to restore it.
How you store your jewellery when you are not wearing it is nearly as important as how you wear it. Poor storage can lead to tangled chains, scratched surfaces, loose prongs from being crushed, and lost small stones that work free from damaged settings.
Store pieces separately. Diamonds can scratch other diamonds, and they will definitely scratch softer gemstones and precious metals. Each piece should ideally be stored in its own soft pouch, fabric-lined compartment, or original box. Jumbled together in a jewellery dish, pieces abrade each other constantly — even when you think they are sitting still, the vibrations of nearby traffic and household activity cause slight movement.
Use a proper jewellery box or chest. A quality jewellery box with individual lined compartments, ring rolls, and necklace hooks keeps your collection organised and protected. Necklaces hung on hooks rather than lying flat are far less likely to become tangled and pull against their clasps. Many jewellery boxes include a separate compartment for pieces being repaired or in need of cleaning — a useful habit to develop.
Control humidity and temperature. Extreme humidity can damage some materials (swelling wood settings, degrading adhesives, tarnishing silver), while extreme dryness can cause pearls and other organic materials to crack. Store fine jewellery at room temperature away from direct sunlight (UV exposure can fade some coloured gemstones over extended periods) and away from heating and air-conditioning vents that create temperature extremes.
Use anti-tarnish products for silver. Silver tarnishes naturally when exposed to sulphur compounds in the air. Anti-tarnish strips placed inside your jewellery box absorb these compounds and significantly slow tarnishing. For sterling silver pieces, these strips can meaningfully reduce the frequency of polishing required to maintain the silver’s bright finish.
Consider a home safe for valuable pieces. Exceptionally valuable pieces — significant diamonds, rare coloured stones, important vintage jewellery — should be stored in a home safe rather than an open jewellery box, both for security and to protect against fire and water damage. Many home insurance policies require high-value items to be specifically listed on the policy; ensure your valuable jewellery is properly insured against loss, theft, and damage.
Even with impeccable home care, fine jewellery benefits from regular professional attention. Our team at IDC Cayman provides comprehensive jewellery maintenance services designed to keep your pieces in perfect condition for decades.
Annual professional inspection: We recommend bringing your most frequently worn pieces — engagement rings, wedding bands, everyday necklaces and bracelets — for professional inspection once a year. Our gemologists will examine every prong under magnification, check for signs of metal fatigue or cracking, assess the security of all set stones, and clean the piece ultrasonically and with steam to remove all accumulated grime. Issues caught early — a prong beginning to wear thin, a tiny crack in a setting, a stone beginning to work loose — are inexpensive to fix. Issues left until a stone is lost are considerably more costly and emotionally distressing.
Prong retipping: Prongs are the most vulnerable parts of a stone setting. They can be bent by impact, worn down by daily abrasion, or fatigued by repeated flexing. A prong that is worn thin becomes genuinely dangerous — the stone can simply fall out during normal wear. Prong retipping involves building up the worn prong tips with additional precious metal, restoring their original height and grip. This is a routine maintenance procedure that, performed proactively, saves stones from loss.
Rhodium plating: As noted above, white gold jewellery requires periodic rhodium re-plating to maintain its bright white finish. IDC Cayman offers this service with quick turnaround times for clients who cannot be without their jewellery for extended periods.
Resizing: Fingers change size over the years due to weight changes, pregnancy, and age. A ring that fits perfectly today may be too tight or too loose in a decade. Professional resizing by a qualified bench jeweller can increase or decrease ring size within practical limits (typically 2–3 sizes in either direction without compromising the ring’s integrity). For rings with continuous pavé diamond settings or eternity bands, resizing requires more specialised work and may have greater limitations.
Re-polishing and refinishing: Over years of wear, even platinum and gold accumulate fine scratches that dull the original finish. Re-polishing restores the mirror-bright high polish (or matte finish, if that is the original specification) to precious metal surfaces. This process involves the careful removal of a microscopic layer of metal, so it should not be done too frequently — once every five to ten years for regularly worn pieces is a reasonable schedule.
Travelling with fine jewellery requires additional care and planning. Many pieces are lost or damaged during travel — left in hotel safes, misplaced in luggage, or damaged by the security screening process.
Always carry fine jewellery in your hand luggage, never in checked bags. Checked luggage is handled roughly, exposed to extreme temperature and pressure changes in cargo holds, and has a meaningful theft rate in some airports. Your most valuable pieces should always be on your person or in the cabin bag you control directly. A dedicated travel jewellery case with individual padded compartments keeps pieces protected and organised, and takes up minimal space in carry-on luggage.
Airport security screening — X-ray machines and body scanners — does not damage diamonds or precious metals, so you can wear most jewellery through screening without concern. However, removing rings and bracelets for the tray screening process creates a risk of forgetting them at the checkpoint. If you wear your engagement ring through security, make a deliberate habit of checking your finger immediately after collecting your belongings — many engagement rings have been left at security checkpoints.
When staying in hotels, use the in-room safe for any jewellery you are not wearing. Hotel safes are generally adequate security for short stays. For extended travel, consider whether it is worth travelling with your most valuable pieces at all — leaving them at home in a secure location and wearing simpler travel jewellery reduces risk significantly without sacrificing style.
Proper insurance is an essential element of fine jewellery care that many owners overlook. Standard home contents insurance policies typically have modest coverage limits for jewellery and may exclude certain types of loss (loss without evidence of theft, for example). For significant pieces, a dedicated jewellery insurance policy or a rider (endorsement) added to your existing home policy provides more comprehensive coverage.
To insure fine jewellery properly, you will need a current independent appraisal from a qualified gemologist — not the purchase receipt, but a formal written appraisal describing the piece in detail and assigning a replacement value. IDC Cayman can provide detailed written descriptions of all pieces we sell, which serve as the foundation for insurance appraisals. We recommend updating appraisals every three to five years, as diamond and precious metal values change over time — an appraisal from ten years ago may significantly undervalue a piece in today’s market.
For visitors to Grand Cayman purchasing fine jewellery at IDC Cayman, it is important to contact your insurer before or immediately after purchase to ensure new pieces are covered during travel home. Many policies can be updated by phone or email to add new items to the schedule within days of purchase.
IDC Cayman offers comprehensive care and maintenance services for all fine jewellery, whether purchased from us or elsewhere. Our in-house workshop is equipped with professional ultrasonic and steam cleaning equipment, polishing machinery, and the tools required for most jewellery repairs. For more complex repairs or custom modifications, we work with a network of trusted master jewellers whose craftsmanship meets our exacting standards.
Services available include professional cleaning and inspection, prong retipping and rebuilding, rhodium plating, ring resizing, stone replacement (with GIA-certified matching stones where appropriate), clasp and jump ring replacement, chain soldering, re-stringing of pearl and bead jewellery, and full re-polishing and refinishing. We also provide written condition reports and updated descriptions for insurance purposes.
We encourage all IDC Cayman clients to think of us as their jewellery partners for life — not just the store where you purchased your piece, but the team that helps you care for and maintain it over the years. Fine jewellery, properly cared for, improves with age — it acquires a patina of wear that reflects a life well-lived, while remaining as beautiful and structurally sound as the day it was made. That is our commitment to every client: jewellery that serves you beautifully, safely, and brilliantly for a lifetime and beyond.
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