--- title: "30% Gem case on CSGOBig: odds, RTP & drops · gambatracker" description: "30% Gem ($800.42) on CSGOBig, a CS2 case site: advertised RTP 90.00% from 13 items with odds. Item values at the site’s own prices, biggest and latest drops." url: https://gambatracker.com/cases/csgobig/372 rendered: 2026-11-11T13:18Z --- [Case sites](https://gambatracker.com/case-sites) / [CSGOBig](https://gambatracker.com/case-sites/csgobig) / [30% Gem](https://gambatracker.com/cases/csgobig/372) # [CSGOBig](https://gambatracker.com/case-sites/csgobig) · 30% Gem A case on CSGOBig, first seen 3 Nov 2026. Every value is CSGOBig's own item price converted from csgobig coin at the rate on the site page. [24h](https://gambatracker.com/cases/csgobig/372?window=24h) [7d](https://gambatracker.com/cases/csgobig/372?window=7d) [30d](https://gambatracker.com/cases/csgobig/372) [All](https://gambatracker.com/cases/csgobig/372?window=all) Price · $800.42 · 800 CSGOBIG\_COIN Advertised RTP · 90.00% · EV $720.38 from 13 items Observed RTP, 30d · — · no counted openings Variance · 7.4× · of price², per opening Tail share · 1 in 25 · of openings carry half the EV Below price · 81.0% · of openings return less than the price ## Advertised vs observed · per window, 95% band and the advertised marker **No counted openings yet** Openings inside battles and free cases are listed but never counted. ## Windows · the test per window | Window | Openings | Observed | Dev. | Method | | --- | --- | --- | --- | --- | | [24h](https://gambatracker.com/cases/csgobig/372?window=24h) | 0 | — | — | — | | [7d](https://gambatracker.com/cases/csgobig/372?window=7d) | 0 | — | — | — | | [30d](https://gambatracker.com/cases/csgobig/372) | 0 | — | — | — | | [All](https://gambatracker.com/cases/csgobig/372?window=all) | 0 | — | — | — | Enough sample: 100 openings and 5 expected rare hits (odds method) or 1,000 openings (sample method). ## Items, odds and values · 13 items · odds sum to 1 · observed counts over 0 openings, 30 days Share of the expected value, most valuable first; colour is the item's rarity. | Item | Odds | Value | EV share | Observed | Expected | Hot / cold | | --- | --- | --- | --- | --- | --- | --- | | [★ Butterfly Knife \| Gamma Doppler (Factory New) (Emerald) knife · covert · Emerald](https://gambatracker.com/items/butterfly-knife-gamma-doppler-factory-new-emerald) | 1 in 100 | $15K 15,000 CSGOBIG\_COIN | 20.8% | 0 | 0.0 | — | | [★ Butterfly Knife \| Doppler (Factory New) (Black Pearl) knife · covert · Black Pearl](https://gambatracker.com/items/butterfly-knife-doppler-factory-new-black-pearl) | 1 in 100 | $11.2K 11,200 CSGOBIG\_COIN | 15.5% | 0 | 0.0 | — | | [★ M9 Bayonet \| Doppler (Minimal Wear) (Ruby) knife · covert · Ruby](https://gambatracker.com/items/m9-bayonet-doppler-minimal-wear-ruby) | 1 in 100 | $8,700 8,700 CSGOBIG\_COIN | 12.1% | 0 | 0.0 | — | | [★ Karambit \| Doppler (Minimal Wear) (Sapphire) knife · covert · Sapphire](https://gambatracker.com/items/karambit-doppler-minimal-wear-sapphire) | 1 in 100 | $6,300 6,300 CSGOBIG\_COIN | 8.7% | 0 | 0.0 | — | | [★ Flip Knife \| Doppler (Factory New) (Ruby) knife · covert · Ruby](https://gambatracker.com/items/flip-knife-doppler-factory-new-ruby) | 1 in 50 | $3,680 3,680 CSGOBIG\_COIN | 10.2% | 0 | 0.0 | — | | [★ Flip Knife \| Doppler (Factory New) (Black Pearl) knife · covert · Black Pearl](https://gambatracker.com/items/flip-knife-doppler-factory-new-black-pearl) | 1 in 50 | $2,300 2,300 CSGOBIG\_COIN | 6.4% | 0 | 0.0 | — | | [★ Ursus Knife \| Doppler (Factory New) (Sapphire) knife · covert · Sapphire](https://gambatracker.com/items/ursus-knife-doppler-factory-new-sapphire) | 1 in 33 | $1,800 1,800 CSGOBIG\_COIN | 7.5% | 0 | 0.0 | — | | [★ Huntsman Knife \| Doppler (Factory New) (Sapphire) knife · covert · Sapphire](https://gambatracker.com/items/huntsman-knife-doppler-factory-new-sapphire) | 1 in 33 | $1,240 1,240 CSGOBIG\_COIN | 5.2% | 0 | 0.0 | — | | [★ Gut Knife \| Gamma Doppler (Factory New) (Emerald) knife · covert · Emerald](https://gambatracker.com/items/gut-knife-gamma-doppler-factory-new-emerald) | 1 in 20 | $820 820 CSGOBIG\_COIN | 5.7% | 0 | 0.0 | — | | [★ StatTrak™ Gut Knife \| Doppler (Factory New) (Sapphire) StatTrak · knife · covert · Sapphire](https://gambatracker.com/items/stattrak-gut-knife-doppler-factory-new-sapphire) | 1 in 20 | $650 650 CSGOBIG\_COIN | 4.5% | 0 | 0.0 | — | | [★ Navaja Knife \| Doppler (Minimal Wear) (Sapphire) knife · covert · Sapphire](https://gambatracker.com/items/navaja-knife-doppler-minimal-wear-sapphire) | 1 in 17 | $400 400 CSGOBIG\_COIN | 3.3% | 0 | 0.0 | — | | [P250 \| Sand Dune (Factory New) weapon · consumer](https://gambatracker.com/items/p250-sand-dune-factory-new) | 26.2% | $0.29 0.29 CSGOBIG\_COIN | 0.0% | 0 | 0.0 | — | | [P250 \| Sand Dune (Field-Tested) weapon · consumer](https://gambatracker.com/items/p250-sand-dune-field-tested) | 43.8% | $0.01 0.01 CSGOBIG\_COIN | 0.0% | 0 | 0.0 | — | Values are CSGOBig's own item prices; EV share = odds × value ÷ EV. Hot / cold compares observed drops of each item with odds × openings; small expected counts are left blank. Odds read from `csgobig:api/cases/getDetails?id=372`, 11 Nov, 13:05 UTC. ## Biggest drops · from this case, by value **No drops yet** No drop from this case seen yet. ## Latest drops · newest first [All Latest drops →](https://gambatracker.com/drops?casino=csgobig&case=372) **No drops yet** No drop from this case seen yet. ## Observed RTP over time · daily, 30 days No history yet ## Catalog changes · price, advertised RTP and contents, per capture | Captured | Price | Advertised | Items | | --- | --- | --- | --- | | 3 Nov, 04:27 UTC | $800 | 90.00% | 13 | Each opening is tested against the capture in force when it happened; a price or odds change starts a new one. listed covert 30.0% consumer 70.0% 18+ **Case opening is gambling with skins as the currency.** At 90.0% RTP, every $100 put into cases returns $90.00 on average: an expected loss of $10.00 per $100, before any one lucky or unlucky opening. A big drop here says nothing about the next one. [BeGambleAware](https://www.begambleaware.org/) [Help & limits](https://gambatracker.com/responsible-gambling) How these figures are produced and labelled: https://gambatracker.com/llms.txt