Last reviewed October 2026 · How we research · Sellers and scores on the UNDECEMBER page.
What the Terms Say
As flagged in the badge: no LINE Games terms clause naming Ruby trading was verified in the material checked for this guide, and none is quoted. The game’s design is the documented context: Rubies are, in PlayerAuctions’ own category copy, “a currency in Undecember” used “to exchange for lower-grade essences, consumables, shop, and trade for goods on the Auction House” — an earned, circulating currency, not a top-up balance.
That design is why delivery looks the way it does. The category’s trading information gives exactly two options: in-game face-to-face delivery, and in-game mailbox delivery. Both happen inside the game, between characters, without any credential changing hands. A seller whose method needs your account login is not using either documented option.
The Official Routes
There is no official Ruby store: Rubies are earned and traded inside the game’s economy, and the game is season-driven — Season 12, “The Farside”, runs September 10, 2026 to January 7, 2027 and added the Agony Wave mode, per the official season notice. The verified outside shelf is PlayerAuctions’: 4 offers at our check, at $0.011, $0.012, $0.030 and $0.030 per Ruby, with order totals from $22.00 to $59.80 shown on the listings and a 12-hour guarantee on every offer. Older crawls of the same page showed 0 and 2 offers — the shelf is thin and moves, so re-check the count and the per-Ruby rate at purchase time.
What Can Go Wrong
- One vendor, four offers, no price discovery. With a single verified vendor and a shelf this small, the “market rate” for a Ruby is whatever a handful of sellers ask. Compare the per-Ruby rate across all live offers, and against what the Rubies will actually buy on the Auction House, before paying.
- Season timing moves the value. UNDECEMBER runs roughly three to four seasons a year, and a seasonal economy reprices around each launch. Rubies bought late in a season buy into an economy about to reset its demand; Season 12’s window (to January 7, 2027) is the current frame.
- Delivery is a trade, with a trade’s failure modes. Face-to-face delivery needs both characters online and meeting; mailbox delivery needs the exact character details the seller asks for. Confirm the amount received in game before the order closes.
- Unverified second vendors. A G2G Rubies leg was claimed by older material but no G2G category could be surfaced in this pass. Offers found there or elsewhere carry no verified category behind them in this guide.
Red Flags to Avoid
- Any Ruby delivery that asks for your account login — the documented options are face-to-face and mailbox only.
- Per-Ruby rates quoted from old crawls or other seasons without a live listing behind them.
- Sellers who will not state the delivery option (face-to-face or mailbox) before payment.
- Bulk Ruby offers priced as an investment — Rubies spend on one game’s Auction House, in a seasonal economy.
- Deals moved off PlayerAuctions’ escrow into chat.
Buying Checklist
- Re-check the live shelf first: 4 offers at $0.011 to $0.030 per Ruby at our check, and the count has moved between crawls before.
- Price the purchase against a named Auction House goal — the gear piece or essences the Rubies are for, at their live listing prices.
- Agree the delivery option in the order thread: face-to-face meeting or in-game mailbox, with the exact character details confirmed.
- Verify the Rubies in game before closing the order, and keep payment inside PlayerGuardian escrow throughout.
- Time larger purchases with the season calendar in mind — Season 12 runs to January 7, 2027.
The Safe Alternatives
Rubies sit on top of an earnable economy: Auction House trading and ordinary play generate them, and our Rubies farming guide covers the earning side, with the season climb in the leveling guide. If you do buy, the verified shelf delivers inside the game’s own trade systems, on your own account, with no login ever requested. See the UNDECEMBER page.
Frequently Asked Questions
How are UNDECEMBER Rubies delivered?
Inside the game, two ways only, per PlayerAuctions’ trading information: face-to-face in game, or by in-game mailbox. Every offer at our check carried a 12-hour delivery guarantee. No login is part of either method.
How much do UNDECEMBER Rubies cost?
PlayerAuctions listed 4 offers at our October 2026 check, at $0.011, $0.012, $0.030 and $0.030 per Ruby, with order totals from $22.00 to $59.80 shown. Older crawls showed 0 and 2 offers — re-check the live shelf before pricing anything.
What are Rubies for in UNDECEMBER?
They are the Auction House currency: per the category copy, Rubies exchange for lower-grade essences and consumables and trade for goods on the Auction House. Price a purchase against the live Auction House listing you actually intend to buy.
Does G2G sell UNDECEMBER Rubies?
No G2G UNDECEMBER category could be surfaced in the verification pass — site-restricted searches returned nothing to fetch — so G2G is not presented as a Rubies vendor in this guide. PlayerAuctions is the only verified vendor.
Sources
- PlayerAuctions: UNDECEMBER Rubies (4 offers at $0.011 to $0.030 per Ruby; face-to-face and mailbox delivery; 12-hour guarantee) (read Oct 20, 2026)
- LINE Games: UNDECEMBER Season 12 “The Farside” official notice (Sep 10, 2026 – Jan 7, 2027) (read Oct 20, 2026)
