"AAA-grade." "Premium quality." "Top-tier gemstones." Almost every jewelry seller says something like this — but colored gemstones aren't graded by an official, government-backed body the way diamonds are. Here's how the AAA/AA/A grading scale actually works, who decides it, and how to tell a real quality claim from a marketing one.
AAA, AA, and A are informal quality tiers used across the colored gemstone trade — not an official, regulated standard like the GIA's 4Cs for diamonds. AAA generally means the strongest color and fewest visible inclusions; grades step down from there. Because there's no single authority enforcing these labels, the same "AAA" claim can mean different things from different sellers — what matters is whether a seller explains their own grading criteria.
How Colored Gemstone Grading Actually Works
Diamonds have the GIA's 4Cs — cut, color, clarity, and carat weight — assessed against a published, internationally recognized scale. Colored gemstones (amethyst, topaz, onyx, peridot, quartz, and the like) don't have an equivalent single, universal system. Instead, the trade widely uses a letter-tier shorthand — most commonly A, AA, and AAA, and occasionally AAAA for exceptional stones or B/C for lower-quality material — to describe overall visual quality.
What Goes Into a Grade
Whoever assigns the grade — a wholesaler, a lab, or the brand itself — is typically weighing the same handful of factors:
- Color depth and consistency — how rich and even the color is across the stone, without washed-out patches or uneven zoning.
- Clarity — how visible any internal inclusions are to the naked eye.
- Cut quality — how precisely the stone is faceted, which affects how it catches light.
- Overall visual character — luster, transparency, and how the stone reads as a finished piece rather than raw material.
AAA vs. AA vs. A vs. "C-Grade": What Each Tier Generally Means
These definitions vary by seller, but here's the general pattern used across most of the colored gemstone trade:
- AAA (top tier) — strong, saturated, even color; few to no inclusions visible without magnification; precise cutting. This is the grade Praise Jewels uses across its collection.
- AA (mid tier) — good color that may be slightly less saturated or even; some minor inclusions may be visible on close inspection; still a genuinely nice stone, just a step below AAA.
- A (commercial/entry tier) — noticeably lighter or less even color, more visible inclusions, and less precise faceting. Often the grade used in mass-market or budget jewelry.
- B-grade or "C-grade" — these labels aren't standardized at all, and different sellers use them inconsistently. Generally they signal a stone with visible flaws, dull or uneven color, or rough cutting — the lowest commercially sold tier. Some listings use "Class 1/2/3" language instead, which follows a similar logic (Class 1 = best) but is just as unregulated.
In short: is AA or AAA better? AAA. Is a AAA stone always better than an "AA+"? Usually, but "AA+" isn't a formally defined grade either — it's a seller's attempt to signal "better than AA, not quite AAA," and its exact meaning depends entirely on who's using it.
Why This Isn't Officially Regulated (and What That Means for You)
Unlike diamonds, there is no single global authority — no equivalent of the GIA — that certifies colored gemstone grades. Grading is typically done in-house by wholesalers, cutters, or the brand selling the finished piece, using the criteria above as a general framework rather than a fixed rulebook.
That doesn't mean the grades are meaningless — a genuinely AAA amethyst really does look noticeably better than a genuinely A-grade one, side by side. It means the label alone isn't proof. Two sellers can both say "AAA" while meaning slightly different things, because there's no outside body checking their work.
Amethyst Rhythm Bracelet — 925 Sterling Silver
Shop the Amethyst Rhythm Bracelet →How to Evaluate a Grading Claim, From Any Seller
- Ask what the grade actually means to them. A seller who can explain their color/clarity/cut criteria is generally more trustworthy than one who just prints "AAA" on a listing.
- Look at the stone itself, not just the label. Even a photo should show even color and minimal visible flaws for a genuinely top-tier stone.
- Check whether the claim shows up consistently. If a brand states its grading standard the same way across its whole catalog — not just on a few "premium" listings — that's a better sign than an isolated marketing claim.
- Understand that "natural" and "graded" are separate questions. A stone can be 100% natural and still be a lower grade, and a synthetic stone can be manufactured to look flawless. Grade describes visual quality; it doesn't by itself tell you whether a stone is natural. See our guide on natural vs. synthetic gemstones for that distinction.
For a look at exactly how this applies to our own collection — including what factors we grade against and how the 925 sterling silver setting and rhodium finish fit in — see Our Sourcing & Quality Standards.
Frequently Asked Questions About Gemstone Grading
What is an AAA-quality gemstone?
AAA is the top commonly used quality tier for colored gemstones, generally meaning strong, even color and minimal visible inclusions. It isn't an officially regulated grade — it's an industry-standard shorthand used by wholesalers and jewelers.
Is AA or AAA better?
AAA is the higher tier. AA stones are still good quality but typically show slightly less saturated or even color, or a few more visible inclusions, than AAA stones.
Which rating is better, AAA or AA+?
AAA. "AA+" is an unofficial, seller-specific label meant to signal "better than AA" — it isn't a standardized step above AA, so its exact meaning varies by who's using it.
What is a C-grade gemstone?
"C-grade" (or "B-grade") generally refers to lower-quality commercial stones with visible flaws, duller or uneven color, and less precise cutting. Like the rest of the scale, it isn't formally standardized.
What are "Class 3" gemstones?
Some sellers use a Class 1/2/3 system instead of letters, where Class 1 is the best and Class 3 is the lowest commercially sold tier. It follows the same general logic as A/AA/AAA but uses different labels — always worth checking what a specific seller means by their own scale.
Does a higher grade mean a more expensive stone?
Generally yes, for the same gemstone type — a AAA amethyst typically costs more than an A-grade amethyst of similar size. But grade isn't the only price factor; rarity of the gemstone type itself, carat weight, and craftsmanship all matter too.
Shop AAA-Grade Natural Gemstones
Every piece in the Praise Jewels collection is set with AAA-grade natural gemstones in hallmarked 925 sterling silver.
A grade is only as good as the standard behind it. Knowing how AAA, AA, and A actually work — and that no outside body is enforcing them — is what turns "trust me" into a question you can actually ask.