About JewelryStorm

What is JewelryStorm?

JewelryStorm is an independent reference site about jewelry — sizing a ring, understanding gemstones, working out gold and metal purity, and looking up birthstones and diamond grading. Alongside the guides sits a set of free calculators and a browsable museum, the Museum of Jewelry & Adornment.

Who is this site for?

Anyone with a practical jewelry question: what ring size to order, what a karat stamp means, roughly what a gemstone’s carat weight is from its dimensions, whether a chain counts as a choker or an opera length, or what a birthstone actually is. It is built for shoppers and collectors, not for professionals submitting formal valuations.

What tools does the site actually have?

Six, all free and all running in your browser:

• Ring Size Converter— moves a size across US/Canada, UK/Australia, EU/ISO, and Japan, plus the inside diameter and circumference in millimetres.
• Gemstone Carat Calculator — estimates a stone’s carat weight from its length, width, depth, and cut shape.
• Gold Value Calculator— estimates the melt value of gold jewellery from its weight, karat, and a spot price you supply.
• Necklace Length Guide— turns a chain length into its standard category, from collar to rope.
• Birthstone Finder— looks up the traditional and modern birthstone for any month or zodiac sign, and the reverse.
• Diamond 4Cs Guide— walks through Cut, Colour, Clarity, and Carat on the real GIA scales.

How do the tools actually work?

Each one is a plain calculation, not a black box. The ring converter reads a size against an embedded jewellers’ chart and derives the rest from the one measurement every system shares — the inside of the band, where circumference = π × diameter. The gemstone calculator estimates a stone’s volume from its shape and dimensions, then multiplies by the specific gravity of the gem type you pick. The gold calculator multiplies weight by karat ÷ 24 (the purity fraction) by the spot price you enter, converting between grams, pennyweight, and troy ounces along the way. The necklace guide maps a length in inches or centimetres to the conventional category names. The birthstone finder is a lookup table of the standard traditional and modern stone lists. The diamond guide explains the GIA cut, colour (D–Z), and clarity (FL–I3) scales and lets you assemble a combination to read back what it means.

Where do the numbers and definitions come from?

Published jewellers’ sizing charts, the specific gravity values recognised for each gem type, and the GIA’s public grading scales. The gold calculator does not fetch a live price feed — you enter the spot price yourself, so the result is only as current as the number you provide. The museum’s entries, images, and facts are drawn from Wikipedia and Wikimedia Commons, credited on each page.

Is anything here a professional appraisal or financial advice?

No. Every tool produces an estimate from the figures you enter, not a certification, appraisal, or investment recommendation. Gemstone identification, gold value, and diamond grading in the real world depend on physical examination. For an actual appraisal, authentication, or valuation, consult a certified gemologist or appraiser, such as one accredited by the GIA.

Are the tools free?

Yes, with no account and no paywall. The site is supported by advertising, which is what keeps the tools free to use.

What is the Museum of Jewelry & Adornment?

A browsable, illustrated timeline covering gemstones, precious metals, rings, necklaces, and heirlooms across history. It sits alongside the tools as a separate, slower section for reading rather than calculating, and every fact and image in it is sourced from Wikipedia and Wikimedia Commons.

Is JewelryStorm affiliated with GIA, a gold exchange, or any jewelry brand?

No. JewelryStorm is independently run and is not affiliated with, endorsed by, or officially connected to the GIA, any gold or bullion exchange, or any jewelry manufacturer or retailer. Where we reference GIA scales or a spot gold price, it is for educational context only.

How do I get in touch?

Through the contact page— for questions about a tool, a correction, or general feedback.