Gemstone education
About Gemstones
Everything you need to know about natural gemstones, explained simply — how they form, what makes one worth more than another, and how to buy with confidence.
- Loose stones in stock
- 16,424
- Countries of origin
- 28
- Certified diamonds
- 10,128
- In-depth stone guides
- 15
The short version
What a gemstone is, and why it costs what it costs
Gemstones have captivated people for thousands of years — admired for their beauty, valued for their rarity, and cherished for their symbolism. Whether you're a collector, a jeweler, or someone looking to make an informed purchase, understanding gemstones is the key to choosing pieces that truly speak to you.
At Sapphire Row, we source and inspect each stone directly from the world's most respected trading centers, ensuring authenticity, transparency, and quality. This page is your foundation; the guides further down go deep on one stone at a time.
Formation
How gemstones are formed
Most gemstones are created deep within the earth under extreme heat and pressure. Over millions of years, geological movement brings them closer to the surface, where they can be mined. Each type of gemstone has a unique formation process, which influences everything from color to inclusions.
Some stones, such as diamonds, form under intense pressure; others, like opals, form from mineral-rich water in sedimentary environments. This diversity in formation is what gives each gemstone its character and uniqueness.
Valuation
What makes a gemstone valuable?
Value is determined by several universal factors. They are not weighted equally, and the weighting shifts from species to species.
The most important factor for most gemstones. Rich, pure, evenly distributed color typically commands higher value — and the hue that counts as fine differs from one species to the next.
Refers to the presence, or absence, of natural inclusions. Some inclusions are acceptable, even expected, depending on the stone.
A well-cut gemstone maximizes brilliance, enhances color, and improves symmetry. Cuts vary by shape and purpose.
Larger gemstones are rarer and often significantly more valuable. The relationship between size and value is not linear — it increases sharply with rarity.
Certain origins, such as Burmese rubies or Ceylon sapphires, are culturally renowned and often command premium prices.
Many gemstones undergo traditional treatments, such as heating, to improve color and clarity. Untreated stones are significantly rarer and more valuable.
Choosing
How to choose the right gemstone
Four questions, in this order. Answer them and the field narrows quickly.
Purpose
Everyday wear, special occasions, or a collection.
Durability
Some stones require more care than others.
Symbolism
Birthstones, emotional meaning, or historical significance.
Budget
Price varies widely by type, quality, and rarity.
The guides
Explore individual gemstones
History, characteristics, treatments, rarity and buying tips — one guide per stone, with what we are currently holding.
Rubies492
in stock
Read guide
Sapphires2,020
in stock
Read guide
Emeralds472
in stock
Read guide
Alexandrites187
in stock
Read guide
Tanzanites190
in stock
Read guide
Opals233
in stock
Read guide
Aquamarines319
in stock
Read guide
Tourmalines259
in stock
Read guide
Garnets379
in stock
Read guide
Amethysts350
in stock
Read guide
Peridots149
in stock
Read guide
Citrines291
in stock
Read guide
Spinels150
in stock
Read guide
Zircons89
in stock
Read guide
Morganites66
in stock
Read guide
How grading works
Reading a grade
Grading is two different systems wearing similar words. These guides keep them apart.
For diamonds
For colored stones
- Color in Colored Stones
- Clarity in Colored Stones
- Gemstone Quality Grades
- Gemstone Treatments
- Gemstone Origin
For both
Pricing & sourcing
Understanding pricing and transparent sourcing
We buy direct and sell direct, which is the whole of the pricing story: there is no chain of intermediaries between the cutter and you. What we commit to on every stone is below.
Accurate disclosure of treatments
Every stone states what has been done to it. Where a treatment is standard for the species, we say so rather than leaving you to guess.
Professional gemological verification
Independent laboratory reports on the stones that warrant them, supplied with the stone.
Transparency in pricing and origin
Where a stone came from, and what it costs, without the chain of intermediaries a traditional retailer has to price in.
New Gemstones
