RB Fine vs Lusterline.
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RB Fine
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Rosy Blue Fine's mission is to reach out to our partners in America to provide them with quality merchandise and superior service with the use of this mobile app. Being a sightholder and manufacturer of loose diamonds, we can support our partners in a number of ways. Now, we have over 7000 GIA Diamonds in all shapes & sizes, Great and Better prices for memo & buying.
Lusterline.
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Lusterline is a professional diamond sourcing app built for B2B jewelry clients. Browse available diamond inventory, review key stone details, compare options, and connect for pricing and orders. Designed for jewelers, retailers, and trade buyers who need a faster, simpler way to source quality diamonds with confidence.
Screenshots
Verdict
The clearest difference is update cadence: Lusterline. at monthly against RB Fine's every 5 months. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
RB Fine ships an update every 5 months, Lusterline. monthly. The most recent releases landed on October 13, 2026 and October 15, 2026 respectively.
| Parameter | RB Fine | Lusterline. |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.4 | 16.4 |
| Further details — not scored | ||
| Size | 58 MB | 53 MB |
| Age rating | 4+ | 4+ |
| Developer | ROSY BLUE FINE INC | LusterLine |
In-app purchases
RB Fine
No in-app purchases
Lusterline.
No in-app purchases
