The Srixon Z-Star Diamond is a three-piece urethane golf ball that sits in the premium segment at $54.99 per dozen. Srixon has quietly built a loyal following among serious golfers and the Z-Star Diamond sits at the top of their line. What Ball Lab can tell you is what’s going on inside the box. We measured weight, diameter, compression, roundness and balance through 36 balls and three boxes to give the manufacturing side of that picture.
Here’s what the Srixon Z-Star Diamond 2026 looks like under the microscope.
Srixon Z-Star Diamond
Pros
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Outstanding quality control – 100% good ball rate on all 36 balls, zero defects
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Compression symmetry rated B – each ball is internally consistent
cons
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Compression consistency rated B- means a measurable variation in ball speed is possible throughout the sample
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Weight consistency rated B- with an outlier in Box 1 pulls the spread wider than the rest of the sample
Our Verdict
The Srixon Z-Star Diamond 2026 earns a Quality Score of 89 and a B+ grade: Conditionally Recommended. Good Ball Rate reached a perfect 100 percent with zero defects on all 36 balls. Any category classified between B- and B with no exceptional weakness and no exceptional strength. Consistency of compression is the category that carries the most weight in our score and rating at B- is what keeps this from a higher score. At $54.99 per dozen, the Z-Star Diamond offers solid build quality across the board.
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Product details
- price: $54.99/dozen
- Construction: 3 piece urethane
- Compression: 93 (Signature)
- Factory: Srixon, Cikampek, Indonesia
- Diameter: 1.6808 in.
- Weight: 1.6096 oz.
- Bad Balls: 0 of 36
The test results
U 2026 Srixon Z-Star Diamond scored 89/100 and earned a B+ grade: Conditionally Recommended. The score is built on a clean fault record and a consistent profile across all five categories.
The good Ball Rate has reached a perfect 100 percent. All 36 balls passed inspection with zero defects noted in core, layers and covers.
The compression consistency is classified in B- with a delta of 8.2 points and a spread that goes from 88.8 to 97.0. A pattern worth noting: box 2 has always been more stable than the other two boxes that contain much of the spread in the sample. If you pull from just one box, your experience may be narrower than the full sample suggests.
The compression symmetry classified at B with a median of 1.5 points against a field average of 1.9. Each ball is internally consistent across the three measurement points.
Diameter consistency graded at B. The sample did not show a consistent pole-versus-seam pattern with 20 of 36 balls falling within the gauge sound on that measurement. The consistency of the weight classified at B- with a range of 0.0117 ounces being the widest in the sample. It was largely driven by a single outlier in Box 1.
At $54.99 per dozen, the Z-Star Diamond providing a consistent manufacturing profile across the board. The uniform ranking in all five categories is what earns it a conditional recommendation at 89.
Find the right golf ball for your game
Use the MyGolfSpy Golf Ball Selector to compare 48 golf balls using data from our robot test 2026. Filter by swing speed and see how each ball performs from driver to wedge to find the best fit for your game.
Compression
Compression is a measure of how much force is required to deform a golf ball; the higher the number, the steadier the dance. Consistency is important because a ball that compresses differently from shot to shot produces different results from shot to shot. Ball Lab measures each ball individually and tracks both the mean and spread within the sample.
U 2026 Srixon Z-Star Diamond average of 93, in the firm range of our database. It is similar in compression to Callaway Chrome Tour and TaylorMade TP5. The compression consistency is classified at B- with a delta of 8.2 points and a spread that runs from 88.8 to 97.0, a little better than the database average of 9.6. A pattern stands out in the data per bullet: box 2 has been consistently stronger than boxes 1 and 3 which contains a significant part of the general spread. Taken in isolation, Boxes 1 and 3 tell a tighter story.
Ball Lab also measures compression symmetry which tracks how well compression is distributed across three points on each individual ball. Is each ball self-consistent? U Z-Star Diamond average 1.5 points of deviation, below the average field of 1.9.
The graphs below detail the compression measurements in our sample.
Weight
Weight consistency is another Ball Lab metric. Even small differences between a dozen balls can result in an inconsistent ball flight. Ball Lab weighs each ball to four decimal places.
U 2026 Srixon Z-Star Diamond average 1.6096 ounces through 36 balls, in the average range of the database. Each ball cleared the USGA maximum of 1.6205 ounces with a range of 1.6014 to 1.6131 and a standard deviation of 0.0027. The range of 0.0117 ounces is the widest in the sample, driven largely by a single outlier in Box 1 that pulled the spread wider than the remaining 35 balls would suggest.
The consistency of the weight is classified as B-.
The graphs below detail the weight measurements in our sample.
Diameter
A ball that is not uniform in shape can track offline on the putting green or produce an inconsistent flight in the air. Ball Lab measures each ball in multiple axes to get a true picture of its shape.
U 2026 Srixon Z-Star Diamond average of 1.6808 inches, above the USGA minimum of 1.680, with a roundness deviation of 0.0006 inches. Each ball deflected the minimum and the sample did not show a consistent pole-versus-seam pattern: 20 of 36 balls fell within gauge noise on that measurement and no sample shape bias was identified. Box 1 was the least consistent of the three at an SD of 0.00073 while Box 3 was the tightest at 0.00043.
The consistency of the diameter is classified in B, in accordance with the uniform profile in all five categories on this card.
The charts below detail the diameter measurements in our sample.
Ball Lab Report Card
Each Quality Score is a weighted average of five grades: good bounce rate, compression consistency, compression symmetry, diameter consistency, weight consistency. Our scoring system penalizes defective balls more severely while giving more weight to compression metrics than weight and diameter.
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