Thahby encyclopedia

Understand gold.
Choose jewelry with confidence.

From gram calculations to jewelry stories: practical guides to gold, silver, diamonds, sizing and history.

29 articles and guides7 topic areas8 calculators and tools
Thahby Journal

Stories and images from the world of jewelry

Explore Thahby’s latest editorial articles on gold, jewelry and gemstones, in their original language.

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Calculations and buying

How to calculate gold value by weight and karat

Convert the ounce price to a gram price, then calculate the metal value of your item.

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Calculations and buying

Gold making charges and your invoice

Compare per-gram, per-item and percentage charges before adding tax.

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Calculations and buying

Gold zakat and mixed karats

Convert different karats to pure gold and understand the calculator’s threshold.

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Gold basics

Gold karats: 24K, 22K, 21K and 18K

Understand purity, fineness marks and the amount of gold in an item.

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Gold basics

Bahraini, Turkish, Kuwaiti and Italian gold

Separate manufacturing origin and design from gold purity.

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Gold basics

White gold, silver and platinum

Understand white-gold alloys, rhodium plating and maintenance.

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Calculations and buying

Buying gold for savings

Compare premiums, resale terms and ownership costs before choosing a bar or piece of jewellery.

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Bars and metals

Gold bars: types, weights and fineness

Understand cast and minted bars, purity marks and the costs beyond their gold content.

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Sizing and design

How to measure your ring size

Measure inner diameter or finger circumference, then check the seller’s size chart.

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Sizing and design

Bracelet and bangle sizing

A clasp bracelet and a closed bangle need different measurements.

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Sizing and design

Choosing a necklace length

Use a string and consider neckline, pendant and body proportions.

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Sizing and design

Gold chain styles explained

Compare cable, curb, Figaro, rope, box, snake and wheat chains.

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Sizing and design

Cast, worked, hollow and tubular bangles

Understand construction terms before comparing size, weight and durability.

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Diamonds and gemstones

Diamond designs and stone settings

Compare solitaire, halo and pavé designs and learn how stones are held in place.

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Diamonds and gemstones

Understanding diamond quality: the 4Cs

Read carat, colour, clarity and cut without confusing weight with appearance.

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Diamonds and gemstones

Natural diamonds, laboratory-grown diamonds and simulants

Understand origin, material and disclosure before comparing prices.

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Diamonds and gemstones

How to read and check a diamond report

Match the report to the stone and verify details with the issuing laboratory.

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History and culture

Gold in the history of world cultures

Gold has carried different religious, social and economic meanings across societies.

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History and culture

Gold in Arab and Islamic history

Explore coins, jewellery and inherited objects without reducing diverse traditions to one style.

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Gold basics

How to distinguish gold from silver and imitations

Use documentation and appropriate professional examination, not colour alone.

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Bars and metals

Silver fineness: 999, 958, 925 and 800

Understand silver content, plating and how purity affects metal value.

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Bars and metals

Silver bars: weight, purity and total cost

Compare fine-silver content with the full purchase and resale terms.

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Bars and metals

Gold weight units: grams, troy ounces and tolas

Keep weight, purity and gemstone carats separate when calculating value.

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Calculations and buying

Selling used gold: comparing offers

Compare the final amount payable, not only the advertised price per gram.

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Calculations and buying

A jewellery buying checklist

Get the material, weight, stones, charges and after-sales terms in writing.

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Care and testing

Caring for gold, silver and gemstones

Choose a cleaning method for every material and finish in the piece.

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Diamonds and gemstones

Ruby, sapphire and emerald: a first guide

Learn the material, origin and treatments before comparing coloured stones.

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Diamonds and gemstones

Natural and cultured pearls: choosing jewellery

Understand pearl origin and the qualities that matter in a finished piece.

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Gold basics

Gold and jewellery glossary

Essential terms for reading descriptions, invoices and reports.

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