How to Compare Two Opals Online: Videos, Size and Condition

You have narrowed the choice to two opals. One catches your eye in a bright video; the other has a shape you prefer and a different price. Watching both clips repeatedly may make the decision harder rather than clearer.

The way forward is to separate the questions. First confirm which physical stones you are comparing. Then look at appearance, fit, condition and transaction terms in turn. A favorite color can make the final decision, but it should not quietly answer a question about an edge, a crack or a mounting.

This is a buying worksheet, not a remote grading method. It uses two documented stones as examples and explains where the available evidence stops. For a frame-by-frame viewing method, use our separate guide to reading opal videos.

Start with one intended use

Decide what you are buying before judging the candidates. A collector may prefer a distinctive pattern that only appears through a particular tilt. A pendant project may depend on an outline and orientation that the receiving jeweler can work with. A ring project introduces its own design and inspection questions.

Write the purpose at the top of your notes. Include the amount available for the loose stone and, separately, for any jewelry work. If the purpose changes halfway through the comparison, acknowledge that change rather than pretending the original shortlist still answers it.

You do not need a finished design at this point. You do need to know which decisions belong with you and which require a jeweler’s physical inspection. Liking the appearance is your decision; accepting a customer-supplied stone for setting is the jeweler’s.

Two real examples with different strengths

Consider TOL-0010, the 1.62 ct yellow-green triangle, alongside TOL-0015, the 1.68 ct multicolor triangle. Their recorded asking prices on 18 October 2026 are $425 and $330 USD respectively, excluding shipping, taxes and setting. These are asking prices, not appraisals or verified sales.

Both sets of dimensions are photo-derived approximations rounded to whole millimeters, not setting tolerances. The owner reports both stones as natural, untreated, solid Coober Pedy opal purchased in the rough at the Kino gem show in Tucson and subsequently cut and polished by the owner. No independent laboratory certificate accompanies either record.

The table does not establish that one is better. It shows why a decision based only on weight or one bright frame would be incomplete.

Pass one: match the identity, not the color

Before comparing brightness, connect each clip with the correct stone record. Follow the outline, any distinctive feature and the visible profile. Match the permanent Ledger ID with the photographs, scale evidence and downloadable card.

This sounds obvious until several similar small opals appear in the same camera session. A nearby filename or capture time can help organize media, but it does not prove a match on its own. The visible stone must still agree with the record. A seller should be able to identify which scale photograph belongs to the offered gem.

Keep the two candidates’ files in separate notes. If a screenshot loses its label when copied into a message, add the Ledger ID before sending it to your jeweler. “The brighter one” is not a durable identifier.

Pass two: compare what the clips actually show

Watch each available sequence from beginning to end. Notice the preferred face-up position, the movement that produces the colors you like and the appearance away from that position. If the video is labeled as an excerpt, do not assume it contains every relevant orientation.

GIA’s opal quality-factor reference discusses viewing angle and lighting when assessing the display. Separate phone recordings are not a controlled comparison. Differences in exposure, background, distance and illumination can influence what you see.

Make a specific observation such as “I prefer the green across the yellow-green triangle during the slow tilt.” Avoid translating it into “this triangle is objectively brighter than the other” unless the viewing conditions actually support that conclusion. Your preference is useful without a technical claim attached to it.

A short showcase may make a stone easier to view by omitting a camera pull-away or an obscured passage. That is a presentation choice, not additional evidence of condition. On our pages, full recordings and showcase excerpts are labeled separately. The current showcase copies are silent and have no artificial color or lighting enhancement; original recordings are preserved.

Pass three: compare fit in millimeters

Put the dimensions beside the video, not in a separate part of your decision. A close-up can make a small gem appear substantial, while a more distant shot can make a broader one look modest. Neither clip should be used as a ruler.

For the two examples, the approximate lengths are 9 mm and 11 mm. That difference may matter more to the proposed design than the 0.06 ct difference in recorded weight. Neither estimate establishes an exact setting size or proves that a standard mounting will fit.

Look at thickness and edge profile as well as length and width. A maximum depth reading does not describe the full dome or every edge. Send the complete record to the jeweler, including the caliper images, and arrange direct measurement before committing to the setting.

If you are buying a loose stone as a gift, give the recipient this choice too. It may be better to choose the gem together or to leave the design decision open than to promise that an unseen mounting will work.

Pass four: give condition its own row

Do not fold condition into a vague feeling that one stone is “nicer.” List the actual disclosed observations and the important unanswered questions. The presence of a back image does not mean the back is free of features, and an attractive cover photo is not a fracture inspection.

For TOL-0010, the cutter confirms no known condition issues. TOL-0015 has a fine hairline crack that is difficult to see with the naked eye, reported stable by the cutter. Have the receiving jeweler inspect the chosen stone and plan its setting.

Other candidates may have more specific disclosures. The $95 teardrop, TOL-0016, has disclosed hairline cracks and an irregular/chipped edge. Its owner considers it stable and settable; the receiving jeweler still needs to inspect and decide. That is not the same buying proposition as a stone without a disclosed crack, even if you prefer its orange flash.

Use the condition and inclusions guide to keep observations, owner assessments and independent findings separate. A good comparison retains uncertainty where it exists.

Pass five: compare the complete purchase

Open the current Etsy listing for each candidate. Confirm that it is available, that the price is in the currency you expect, and that shipping and return terms suit your destination and timetable. Add tax and shipping before comparing totals. Keep the setting budget separate.

For a jewelry project, ask whether the jeweler accepts customer-supplied opals and what must be inspected before the work is agreed. Do not schedule the process on the assumption that an inspection or design decision will happen inside a particular return period. Review the actual transaction terms first.

An article is a reference, not the offer. Current stock and terms can change. The exact Etsy listing governs checkout, and communication about an Etsy purchase should remain through Etsy.

A five-row worksheet you can reuse

Use the same questions for both stones:

1. Identity: Do the record, photographs, video and weight evidence describe the same item?
2. Appearance: Which shown orientation do I prefer, and what does it look like away from that angle?
3. Fit: Are the approximate outline and profile suitable for discussing my project with a jeweler?
4. Condition: Which features are disclosed, and what still requires inspection or another view?
5. Complete cost and terms: What am I paying for, what is excluded, and which current marketplace terms apply?

Write “not answered” wherever necessary. Do not create a numerical total that lets a strong color score cancel an unresolved condition issue. If both candidates meet your practical requirements, personal preference can be the deciding factor. If neither does, keeping the budget unspent is a valid result.

What if one video looks much better produced?

Treat that as an advantage in readability, not automatic proof of a superior gem. Ask whether the weaker presentation leaves an important question unanswered. A targeted additional view is more useful than trying to normalize different lighting in your imagination.

What if I prefer the less expensive stone?

That is a reasonable choice when its appearance, condition and physical fit suit your purpose. You do not need to spend the full budget. You do need to understand any disclosure that contributes to the lower asking price.

Where can I compare the current records?

Browse the available loose Australian opals, read the under-$250 examples if that is your budget, and keep the Opal Guide beside the individual stone pages. Choose from the documented stones, not from a competition between two isolated flashes.