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    Petra Grounds

    5.0 (2 reviews)
    InexpensiveCoffee & Tea

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    Grid Coffee - Hot Vanilla Latte to go with

    Grid Coffee

    4.3(573 reviews)
    0.7 mi
    $$

    Coffee and matcha: 10/5 -creamy, rich, not too sweet…read moreService great -coffee gets made fast Vibes good - good for studying, seating got cushions now Come here at least one every week

    This review is LONG OVERDUE! :) I've been coming here since December 2021 & it's hands down my…read morefavorite coffee shop in Diamond Bar. I'm a matcha person so I've only ever gotten their matcha, and if not just their strawberry hibiscus (no longer served), herbal tea, and strawberry milk. I love their selection of matcha: strawberry with chunks. One of the best I've had! Their blueberry matcha is pretty delicious also. The customer service is great. Everyone is kind and efficient. I'd say the baristas kind of keep to themselves though and aren't overly enthusiastic. But overall, still welcoming & nice! The atmosphere is simple with wood seating areas. I like it. However sitting for a long duration can be a little uncomfortable since there's not much back support, but luckily they have a basket with padded pillows to sit on. Recently they added tables along the corner nook area which is great! Aside from that they have little tray-like table tops to set your drinks on or laptops/books/etc; while working. There's also plenty of outlets which is a plus. Not to mention they always seem to have a good playlist goin' :) Oh! & they have outside seating as well underneath shaded umbrellas. My only complaint is it gets really hot in there during the hotter months. Especially since they're facing south and catch all the direct light early on in the day. Don't get me wrong, I love the natural lighting! It's just more prone to getting hotter & I'm not sure if they have A/C. I'm sure they probably do but it's never been exactly cold in there like most coffee shops, mainly room temperature. All in all Grid is a great spot! I highly recommend :)

    Photos
    Grid Coffee - Blue lavender latte and strawberry latte

    Blue lavender latte and strawberry latte

    Grid Coffee - Blue lavender latte

    Blue lavender latte

    Grid Coffee - Spanish caffe latte iced

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    Spanish caffe latte iced

    Margin Cafe Coffee Roasters - Inside of the cafe

    Margin Cafe Coffee Roasters

    4.5(300 reviews)
    0.6 mi
    $$

    Was walking after my meal on a Saturday afternoon and stopped by Margin Cafe…read more Saw the Biscoff Latte and immediately wanted that. However I also saw a Butter Pecan Latte and was conflicted. The staff said their biscoff latte is their specialty so i decided to try that drink. It wasn't that sweet and it was bad. Inside is very nice, around 5-6 tables and a couch, with some bar seats near the door and a few benches as well.

    I went to Margin Roasters on a Sunday at around 10:30 AM. Looking for a good study spot with good…read morecoffee, pastries, and WiFi. A few of these expectations were met. For the pastries, it looked like a lot of the ones I was hoping from browsing online were not available. I ended up getting the biscoff cheesecake. It was on the sweeter side but it was very good. For the drink, I ended up getting the banana latte. Been on a streak of getting that lately so wanted to compare with other stores. I didn't get a lot of banana in the taste. At least it had an espresso shot for the caffeine fix and did not taste like the artificial banana. Nothing special there and stand out. For the interior, they had a few seating they primarily accommodated a few groups of four and two. I was able to grab a bench seat that had an outlet. However, there wasn't enough space for my laptop and the items I ordered. WiFi was available but it had a 90 minute limit. The store had a moderate noise level and stayed busy throughout the time that I was there. The service on the order was quick and they do bring it out to you. The store also has their own house espresso which was a medium dark roast. American Express is accepted as a payment option here. Overall, it was a decent work spot. If I come back, I'd prefer to try another drink and hope other pastries are available. Would recommend the biscoff cheesecake for those that want something sweet and the house coffee beans for those that like medium roasts.

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    Margin Cafe Coffee Roasters - Cold brew

    Cold brew

    Margin Cafe Coffee Roasters
    Margin Cafe Coffee Roasters

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    TP Tea - Tie Guan Yin Milk Tea with Boba

    TP Tea

    4.0(168 reviews)
    2.0 mi
    $$

    Clean, well lit place. Service is excellent plus there is a…read morescreen to show all the customers the progression of your order. Tea is flavor just right. Brewed great.

    Convenient and Customizable -- A Solid Go-To My all-time…read morefavorite boba spot was Sunright Tea Studio, but unfortunately it's closed down, so I've been on the lookout for a replacement -- and this place has become my current go-to. What I love most here is the ordering experience. There are multiple large touchscreens where you can fully customize your drink -- sugar level, ice level, add-ons, substitutions, you name it. I almost always go for zero sugar, and the fact that I can do that easily is a huge plus for me. It's the kind of flexibility that modern boba shops should all offer. The portions are generous and the prices are reasonable, which is refreshing compared to some other spots in the area. Is it the most amazing boba I've ever had? Honestly, no -- but the ability to build your drink exactly the way you want it more than makes up for it. There's also a large display screen showing order status, so you always know when your drink is ready. It's a small touch, but it makes the whole experience feel smooth and stress-free. I'll be real though -- I probably drink more coffee from the Starbucks across the street than boba from here. At the end of the day, coffee feels like the healthier daily habit. But when I'm in the mood for something different, this place is where I'll be.

    Photos
    TP Tea - Interior

    Interior

    TP Tea - Creme brulee

    Creme brulee

    TP Tea

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    Petra Grounds - coffee - Updated May 2026

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