At Kirthi Diamonds, established in 2006 with a family heritage in the diamond trade dating to 1975, every stone above 0.30 carats is sold with either a GIA or IGI certificate. Here is how to decide which one is right for your purchase. What is GIA certification? The Gemological Institute of America, founded in 1931, created the modern 4Cs grading framework — Carat, Cut, Colour, Clarity — that the global diamond trade still uses. A GIA report grades a loose diamond against the strictest published standards in the industry and includes a laser-inscribed report number on the diamond's girdle for permanent identification. GIA reports are issued for loose, unset diamonds. The laboratory has facilities in the United States, India (Mumbai and Surat), Belgium, Israel, Hong Kong, Japan and Botswana. GIA does not certify finished jewellery — only the central stones, which are then set by the retailer or designer. What is IGI certification? The International Gemological Institute, founded in 1975 in Antwerp, is the world's largest independent gem-grading laboratory by volume. IGI grades both loose diamonds and finished jewellery pieces, which is the principal reason it dominates the Indian retail jewellery market. IGI grading reports use the same 4C framework as GIA. For finished jewellery, IGI issues a **Jewellery Identification Report** that documents the centre stone, the side stones, the metal, and a unique reference number tied to the piece. This is particularly useful for studded bridal sets, engagement rings with multiple diamonds, and pavé-set pieces where loose-stone grading would be impractical. Key differences between GIA and IGI in the Indian context | Factor | GIA | IGI | |---|---|---| | Founded | 1931 | 1975 | | Grading scope | Loose diamonds only | Loose diamonds and finished jewellery | | Premium on resale value | Higher | Slightly lower for equivalent grades | | Turnaround | Longer (10–20 days) | Faster (3–10 days) | | Industry use | Investment-grade solitaires, high-value singles | Engagement rings, studded jewellery, bridal sets | | Cost passed to buyer | Higher | Lower | | Recognition in India | Strong | Stronger (volume-led) | GIA is generally considered the stricter laboratory. The same physical diamond, sent to both labs, can come back with a one-grade difference in colour or clarity — typically with GIA giving the lower (stricter) grade. This is well-known across the trade and is one reason a GIA-certified VS1, E-colour stone commands a higher price than the equivalent IGI-graded stone. For an Indian buyer, this means two things: 1. A GIA certificate is worth a small premium if you anticipate reselling internationally or treating the diamond as a long-term store of value. 2. An IGI certificate is the more sensible choice for finished bridal jewellery, studded sets, and pieces where the design — not the central stone alone — is what you are buying. Which should you choose when buying in India? The honest answer depends on your purpose: Choose GIA if: - You are buying a solitaire engagement ring or a single high-value stone (typically 0.50 carats or larger). - You expect to resell or trade up internationally in the future. - You want the strictest possible third-party verification of the 4Cs. - The stone is the primary cost of the piece — not the design or setting. Choose IGI if: - You are buying a bridal set, multi-stone pendant, or studded jewellery where every diamond is graded together. - The design and craftsmanship matter as much as the central stone. - You want a faster purchase timeline. - You are buying a piece in the 0.30–0.50 carat centre-stone range, where the GIA premium has limited payback. For most Kerala buyers — particularly bridal-jewellery purchasers — IGI is the right choice for studded pieces and GIA is the right choice for single-stone engagement rings and investment pieces. What Kirthi Diamonds recommends At our Kochi boutique on Bypass Road, Palarivattom, and our Calicut boutique opposite Federal Bank in Puthiyara, we stock and certify against both GIA and IGI standards. We do not push one over the other — we match the certification to your purpose. For an engagement ring with a 0.70-carat solitaire, we typically recommend GIA. For a Kerala bridal necklace set with 4–6 carats of total diamond weight distributed across many stones, IGI's jewellery-identification report is the practical standard. Every Kirthi creation, regardless of laboratory, carries our **lifetime buyback and exchange policy** — your certificate is not just a grading document, it is the basis for our long-term valuation. Beyond the diamond grading, all gold used in Kirthi jewellery is **BIS hallmarked** at 18kt or 22kt — a separate certification covering purity of the precious metal itself. How to verify a GIA or IGI certificate before you buy Both laboratories publish their grading reports online. Before paying for any certified piece in India, do this in the showroom: - **GIA**: Visit `gia.edu/report-check` and enter the report number from the certificate. The website returns the full report with all 4C grades, measurements, and a diamond plot. - **IGI**: Visit `igi.org/verify-your-report` and enter the report number. The same verification appears. If a retailer is unwilling to let you check the report number live in front of them, walk away. At Kirthi we encourage every client to verify the certificate at the boutique before finalising any purchase. Frequently Asked Questions Is a GIA-certified diamond automatically better than an IGI-certified one? Not necessarily. A GIA report is stricter on grading, but a physically excellent diamond graded by IGI is still a physically excellent diamond. The certificate documents the stone; it does not alter the stone. For loose investment-grade singles, GIA carries a small premium on global resale. For finished jewellery, IGI is the practical industry standard in India. Are GIA and IGI diamonds priced the same in India? For an equivalent grading on paper, GIA-certified loose diamonds typically trade at a 5–15% premium over IGI-certified equivalents in India, because of GIA's stricter grading reputation. For finished jewellery sets, the difference is less pronounced because the value is distributed across design, gold, and multiple stones. Can a diamond have both a GIA and an IGI certificate? In rare cases yes — usually for high-value loose stones whose owners have submitted them to both laboratories. In retail, you will almost always see one certificate per stone. If a retailer claims a stone has been "double-graded," ask to see both physical reports and verify both online. Does GIA or IGI certification cover the gold in my jewellery? No. Diamond certification covers the diamond only. The gold's purity is certified separately through **BIS (Bureau of Indian Standards) hallmarking**. At Kirthi every gold component is BIS hallmarked at 18kt or 22kt purity, in addition to the diamond's GIA or IGI grading. Where can I see GIA and IGI certified pieces in Kerala? You can view our certified inventory at the Kirthi Diamonds boutiques in Kochi (34/572 By Pass Road, Palarivattom, open Mon–Sat 10am–7:30pm) and Calicut (61/11508A, opposite Federal Bank, Puthiyara, open Mon–Sat 9:30am–7:30pm). Every loose diamond above 0.30 carats and every bridal piece comes with its full certificate at the time of purchase.