Onyx Eclipse review: the roaster's darkest coffee for milk and filter

Onyx calls Eclipse its most developed offering and says it chooses Latin American coffees that withstand traditional dark roasting. The checked page identifies Colombia, washed processing and Caturra, with rotating microlots. That is today's product record, not a promise about every future box. Its ground Agtron figure is Onyx's own roast-color information; it should not be translated into a universal flavor or caffeine measurement. [1]

The positioning matters because Onyx's Geometry and Monarch occupy different roles. Eclipse is for the buyer who wants roast development itself. Treat it as a separate coffee, even though all three can be made as espresso. The product page explicitly marks filter as its preferred extraction while saying the coffee can also pair with dairy as espresso. [1] [5] [6]

Baker's chocolate, burnt sugar and smoked vanilla bean are Onyx's descriptors. Its story says a long development curbs acidity and builds a heavy body. Those are the roaster's intended effects; Coffeedant has not measured acidity, body or sweetness in a delivered Eclipse bag. The current origin might shift while the dark-roast design remains. [1]

One espresso owner described Eclipse as promising because they personally wanted bitterness rather than a sour shot; another called it an old-school espresso choice. A separate brewing discussion shows that even owners who choose the same dark roast may need to adjust recipe and equipment. These are self-selected preferences and troubleshooting cases, not a population-level score or proof that every lot tastes alike. [2] [3] [4]

Onyx's current espresso panel gives 20 g coffee and a 47 g beverage, about 1:2.35. Its timing and pressure sequence refers to Onyx's linked Series 1 profile, so a home machine should not be assumed to reproduce those settings. Use the dose only if your basket allows it, weigh the drink and adjust the grind from the actual roast date and your preferred result. [1]

The French-press example is different: 25 g coffee to 400 g water at 205°F, with a coarse grind and a 2:30 plunge in the presented sequence. Do not use that 1:16 press ratio in a portafilter. If most household coffee is black filter, this documented press role may be a better reason to try Eclipse than the word espresso in a retailer listing. [1]

Onyx displays a recent roast batch record on its product page, but that batch cannot identify a bag you have not received. Check the package roast date and whether the current origin is still Colombia before copying the present composition into a repeat order. The site lists 2 oz, 10 oz, 2 lb and 5 lb variants at the check; confirm the chosen format and availability at checkout. [1]

Begin with 10 oz if the dark-roast brief is new to you. Buy a larger format only after learning how quickly your household uses it and how its flavor changes in your storage conditions. Keep opened whole beans sealed away from heat and moisture, then grind near brewing. That is practical storage guidance, not a claim that all dark roasts peak on one fixed day. [7]

Onyx publishes green cost, commodity comparison and production-cost context for Eclipse. Those figures describe parts of its sourcing and production, not a consumer checkout price, a discount or a verified producer income rate. This review deliberately makes no current per-shot price claim. Compare the selected US whole-bean pack, tax and delivery total in the actual cart. [1]

The meaningful premium is whether you really want a roast-forward Onyx coffee and can finish the size. If what you enjoy about Onyx is fruit and acidity, Geometry or Monarch is a more relevant small-bag comparison than buying Eclipse solely because it is the darkest entry. [5] [6]

Buy a small current bag, note its roast date and origin, and start with Onyx’s published recipe for the brewer you actually use. For espresso, the 20 g to 47 g yield is a starting point only if your basket accommodates that dose. Compare a neat shot with your usual milk serving. A dark blend is useful when you enjoy its roast direction in the finished drink, rather than when a roast label alone sounds familiar.

Monarch is Onyx's separate darker chocolate, molasses and berry blend with a 19 g to 47 g espresso start. Geometry is a brighter café espresso with a 20 g to 47 g start. Their published ratios are close, but their roaster briefs differ; the number alone does not tell you which cup you will prefer. [5] [6]

Choose Eclipse when developed roast, a low-fruit brief and milk or press use are central. If you want a fixed current farm or named lot, buy a single-origin listing and verify its harvest record. No source here establishes a Coffeedant side-by-side tasting or the taste of your future bag.

Research-led review of the current Onyx page and limited, dated owner accounts. No Coffeedant tasting, sensory score, extraction measurement or current retail offer.

Official record checked November 11, 2026 for the US whole-bean product. Current origin, roast batch, selected size and delivered total can change.