The Riakoob Journal
Collector Guides
Everything we know about buying, certifying and caring for diamonds, gemstones, high jewelry and fine art — written for collectors, free to read.
Diamonds · 6 min read
The 4Cs of Diamond Quality, Explained by a Jeweler
Cut, colour, clarity and carat — how each one affects a diamond's beauty and price, and which matters most when you buy.
Read the guide →Diamonds · 5 min read
Fancy Colored Diamonds: Nature's Rarest Gems
Why pink, green and blue diamonds command record prices, how their colour forms, and what to check before you invest.
Read the guide →Gemstones · 5 min read
How to Buy an Emerald: Colour, Origin and Treatment
From Colombian Muzo mines to oil treatment — what separates a fine emerald from an expensive disappointment.
Read the guide →Care · 4 min read
Caring for Fine Jewelry: A Collector's Handbook
Storage, cleaning, insurance and servicing — how to keep diamonds, gold and gemstones brilliant for generations.
Read the guide →Collecting · 6 min read
Investing in Fine Art and High Jewelry
How tangible assets like certified diamonds, rare gemstones and original art hold value — and how our 12-month value promise works.
Read the guide →Custom · 5 min read
How to Design Your Own Custom Jewelry Piece
From a sketch or photo to a finished heirloom — the bespoke process step by step, and how to upload your design to us.
Read the guide →Gemstones · 5 min read
Custom Gemstone Cutting and Production Explained
How rough crystals become precision-cut gems made to your exact shape, size and colour.
Read the guide →Watches · 6 min read
Luxury Watch Buying Guide
Papers, service history, factory vs. aftermarket diamonds and how to protect your watch's value.
Read the guide →Art · 4 min read
Hanging, Lighting and Caring for Fine Art
Placement, humidity, UV light and insurance — keep your art safe and beautiful for decades.
Read the guide →